iptvnator/docs/architecture/workspace-shell.md

# Workspace Shell

This document records the current workspace-first shell contract. It is the
stable replacement for the older UI refactor summary.

Related:

- [Workspace Dashboard](./workspace-dashboard.md)

## Summary

- `/workspace` is the primary app surface.
- `WorkspaceShellComponent` owns the persistent frame: rail, header, optional
  context panel, content outlet, and external playback footer.
- Descendant workspace pages inherit `layout = 'workspace'` from the
  `/workspace` root route.
- Provider route trees now bootstrap through route-scoped session providers
  instead of nested provider shell components.

Core implementation:

1. `apps/web/src/app/app.routes.ts`
2. `libs/workspace/shell/feature/src/lib/workspace-shell/workspace-shell.component.ts`
3. `libs/workspace/shell/feature/src/lib/workspace-shell/workspace-shell.component.html`
4. `libs/workspace/shell/feature/src/lib/workspace-shell/services/workspace-shell.facade.ts`
5. `libs/workspace/shell/feature/src/lib/workspace-shell/services/workspace-shell-route-state.service.ts`
6. `libs/workspace/shell/feature/src/lib/workspace-shell/services/workspace-shell-search.service.ts`
7. `libs/workspace/shell/feature/src/lib/workspace-shell/services/workspace-shell-search-sync.service.ts`
8. `libs/workspace/shell/feature/src/lib/workspace-shell/services/workspace-shell-header.service.ts`
9. `libs/workspace/shell/feature/src/lib/workspace-shell/services/workspace-shell-command-palette.service.ts`
10. `libs/workspace/shell/feature/src/lib/workspace-shell/services/workspace-shell-xtream-import.service.ts`
11. `libs/portal/shared/util/src/lib/navigation/portal-route.utils.ts`
12. `libs/portal/shared/util/src/lib/navigation/portal-rail-links.ts`
13. `libs/portal/shared/ui/src/lib/navigation/portal-rail-links.component.ts`

## Route Contract

Current workspace routes:

1. `/` -> `/workspace`
2. `/workspace` -> functional redirect `workspaceEntryRedirect`
   (`WorkspaceStartupPreferencesService.resolveInitialWorkspacePath()`;
   `/workspace/dashboard` by default, `/workspace/sources` when the dashboard
   is disabled, or the last restorable route under
   `StartupBehavior.RestoreLastView` — `dashboard` itself is guarded by
   `dashboardAccessGuard`)
3. `/workspace/dashboard`
4. `/workspace/sources`
5. `/workspace/playlists/:id/:view` (plus `favorites` and `recent` siblings)
6. `/workspace/global-favorites`
7. `/workspace/global-recent`
8. `/workspace/search`
9. `/workspace/downloads`
10. `/workspace/settings/:section` (`/workspace/settings` redirects to
    `general`; the settings context panel links each section page)
11. `/workspace/xtreams/:id/...`
12. `/workspace/stalker/:id/...`

Compatibility redirect:

1. `/settings` -> `/workspace/settings`

Provider route integration:

1. `apps/web/src/app/app.routes.ts` marks the `/workspace` root route with
   `data.layout = 'workspace'`.
2. `isWorkspaceLayoutRoute(...)` treats that layout marker as inherited route
   state for all descendants.
3. Xtream and Stalker parent routes attach route-scoped session providers that
   bootstrap the active playlist, sync provider section state, and clean up
   provider-local state when the route is destroyed.
4. Xtream route bootstrap is DB-first for already imported Electron playlists:
   if the requested section has persisted categories and content, the route
   hydrates from SQLite even when the portal status probe reports unavailable,
   expired, or inactive. Fresh/no-cache Xtream routes still use the status probe
   to block remote imports before the loading overlay starts.
5. Workspace routes no longer rely on nested provider shell components for
   hidden local chrome.

## Shell Structure

The shell is intentionally split into four persistent regions:

1. Left rail:
    1. Static workspace links for dashboard, sources, global favorites, and
       recently viewed. The routed global-search rail link is Electron-only
       because its data source is the SQLite worker bridge.
    2. Provider-aware context links derived from the active or current playlist.
    3. Settings remains a persistent footer shortcut in the rail.
2. Top header:
    1. Playlist switcher.
    2. Route-aware search input and command palette trigger.
    3. Add source action.
    4. Optional playlist refresh and route-specific shortcut actions.
    5. Downloads shortcut in Electron.
3. Main body:
    1. Optional left context panel.
    2. Main router outlet content.
4. Optional footer:
    1. External playback session bar when a docked session is visible.

`WorkspaceShellComponent` binds only to `WorkspaceShellFacade`. The facade is
kept as a thin template-facing API and delegates ownership to component-scoped
services:

1. `WorkspaceShellRouteStateService` owns current route parsing, rail links,
   context-panel state, dashboard startup preference, and playlist source
   signals.
2. `WorkspaceShellSearchService` owns the route-aware header search capability
   and public search actions.
3. `WorkspaceShellSearchSyncService` owns the search query signals, debounced
   application, provider-store synchronization, and query-param sync.
4. `WorkspaceShellHeaderService` owns playlist title/subtitle, account/info
   actions, refresh action state, and recent-items bulk cleanup.
5. `WorkspaceShellCommandPaletteService` owns command-palette dialog lifecycle
   and recent-command recording.
6. `WorkspaceShellXtreamImportService` owns Xtream import/refresh overlay
   state and labels.

When adding shell behavior, prefer placing it in the service that owns the
nearest existing state. Keep `WorkspaceShellFacade` as a stable re-export layer
for the template unless the template contract itself intentionally changes.

## Context Panel Rules

The shell decides which secondary panel to show from the current route:

1. `/workspace/sources`
    1. `WorkspaceSourcesFiltersPanelComponent`
2. Xtream category sections (`live`, `vod`, `series`)
    1. `WorkspaceContextPanelComponent`
3. Stalker category sections (`itv`, `radio`, `vod`, `series`)
    1. `WorkspaceContextPanelComponent`
4. `/workspace/settings/:section`
    1. `WorkspaceSettingsContextPanelComponent`
5. Downloads sections
    1. `WorkspaceCollectionContextPanelComponent`

The context panel is part of the shell contract. New workspace-level routes
should explicitly decide whether they need one rather than adding local
sidebars inside feature pages.

Xtream and Stalker category panels preserve provider/server category order by
default. The panel header exposes a sort menu next to category search with
`Server sorting`, `A-Z`, and `Z-A`; when alphabetical sorting is active,
synthetic "all categories" entries stay pinned before sorted provider
categories.

On live sections the category panel can be folded away independently of the
channels list; the folded panel is reachable as a popover from the channels
header through the `LIVE_CATEGORIES_POPOVER` token the shell provides. The
three nested levels, their affordances and persistence are specified in
`iptvnator-ui-guidelines.md` ("Collapsible Live Sidebar").

A category click in a LIVE section (Xtream `live`, Stalker `itv` and `radio`)
changes only the selected category: the live layouts gate their player on the
store's selected item, so the handler must not clear it — the channel the user
is watching keeps playing while the sidebar re-filters (Xtream: #936; Stalker:
`onStalkerCategoryClicked` returns before `clearSelectedItem()`). VOD and
series category clicks do drop the open detail (`setSelectedItem(null)` /
`clearSelectedItem()`) because they navigate to a list route.

The channel header offers **Show playing channel** when browsing excludes the
active channel. It returns to that category and focuses the row without
restarting playback; remote commands retain captured playback order. See the
[queue and reveal contract](./remote-control.md#live-channel-return-and-playback-order).

## Search And Navigation Rules

Search is shell-owned and route-aware:

1. On settings routes, searches the settings themselves (see
   [Settings search](#settings-search)).
2. Enabled on sources routes.
3. Enabled for `/workspace/search`, which is the Electron-only routed
   global-search view. `Ctrl/Cmd+F` in Electron opens this route and
   focuses/selects the header search input instead of opening a fullscreen
   dialog.
4. Enabled for supported Xtream and Stalker content/search views.
5. Placeholder text and search handling vary by provider and section.
6. Input changes are debounced before route/store updates are applied.
7. Global search uses the header input as its primary input and writes the
   search phrase to the `q` query parameter, so history/back-forward behavior
   matches the rest of the workspace.
8. The URL is authoritative for the search box only when it carries search
   intent. `WorkspaceShellSearchSyncService` re-reads `q` on every
   `NavigationEnd`, but an **app-initiated** navigation that stays on the same
   page and carries the term already applied is always ignored — whether or
   not a debounce is still pending. Otherwise a page writing an unrelated
   query param (a downloads filter chip, a refresh bump) or the router echoing
   back our own trimmed `q` would reset the box to the applied term, eating
   everything typed since: the whole word while the first keystroke is still
   debouncing, or a just-typed trailing space once the debounce has fired
   ("Bein " would snap to "Bein" and typing on would yield "BeinSports").
   Applied terms are always stored trimmed (`applySearchQuery` and
   `setSearchState` both trim), so the echoed `q` compares directly; the box
   keeps exactly what the user typed. Pages are free to write their own query
   params while the user types; they must not assume the shell will re-apply
   the search afterwards.
9. Browser history overrides that guard. The exemption is keyed on
   `Navigation.trigger === 'imperative'`, so back/forward always re-applies
   what the history entry carries, even mid-typing.
10. Applying a term explicitly supersedes a queued one. `applySearchQuery()`
    cancels any pending debounce, so the Enter key committing a trimmed term
    cannot be overwritten a moment later by the untrimmed keystroke still
    waiting behind it.

Rail navigation is also shell-owned:

1. Workspace-global entries are static.
2. Provider entries come from `buildPortalRailLinks(...)`.
3. On dashboard, sources, settings, global search, global favorites, and global
   recent, the shell falls back to the currently selected playlist so provider
   navigation remains available even outside a provider route.

Command palette behavior is shell-owned but view-extensible:

1. The shell resolves commands into groups in fixed order: current view,
   this playlist, global, then settings. The settings group appears only for a
   non-empty query and holds at most six settings matches (see
   [Settings search](#settings-search)).
2. Shell-owned commands are derived from route context and current playlist
   state; empty groups are omitted instead of rendering disabled placeholders.
3. Workspace features contribute current-view commands through
   `WorkspaceViewCommandService`.
4. Header shortcut actions can opt into palette exposure by attaching palette
   metadata through `WorkspaceHeaderContextService`.
5. Filtering matches command labels, descriptions, and keywords, and keyboard
   selection always lands on the first enabled command.
6. A "Recently used" section is rendered above the standard groups when the
   query is empty and at least one stored id resolves to a visible+enabled
   command; ids are persisted via `RecentCommandsService` (capped at 5,
   stored at `STORE_KEY.RecentCommands`). Storage is **not** pruned by route
   visibility — a navigation command like `Open sources` is invisible while
   the user is on `/workspace/sources` but the id stays in storage so it
   reappears in the recent section after navigating away.
7. Six "Switch player to X" commands are registered globally by
   `WorkspacePlayerCommandsContributor` (VideoJS, HTML5, ArtPlayer, Embedded
   MPV, MPV, VLC). Each command carries a `requires` flag gating its
   visibility: the MPV/VLC ("managed-external") entries are visible only when
   `RuntimeCapabilitiesService.supportsManagedExternalPlayers` is true, and the
   Embedded MPV ("embedded-mpv") entry is visible only after the command
   palette lazily preloads an async `window.electron.getEmbeddedMpvSupport()`
   check and it resolves to `supported` (mirroring the Settings dropdown gate).
   Do not run this Embedded MPV support check from workspace shell bootstrap:
   supported desktop builds may load the native addon while resolving
   capabilities. The entry matching the current `SettingsStore.player()` value
   is disabled. The new player setting applies to the next playback session; an
   existing stream is not re-mounted.

### Settings search

Settings rows are searchable from the header search on `/workspace/settings`
and from the command palette. Both use the same index and ranking.

1. The index is `SETTINGS_SEARCH_ENTRIES` in
   `libs/workspace/shell/util/src/lib/settings-search/`, published through the
   `@iptvnator/workspace/shell/util/settings-search` sub-entrypoint. Eager
   code imports the main shell util barrel, so the index stays out of it and
   ships only in lazy chunks (the initial-bytes ratchet enforces this).
2. Each entry names its section, title and description translation keys,
   untranslated synonyms (`keywords`), runtime `requires`, and an optional
   `fallbackId`. Section definitions (`SETTINGS_SECTION_DEFINITIONS`) are the
   single source for the settings navigation too.
3. Every titled `.setting-item` in the section templates carries
   `data-setting-id`. `settings-search-registry.spec.ts` fails when a row, id,
   title key or description key drifts from the index, so a new settings row
   must be added to the index in the same change.
4. `SettingsSearchService.search()` matches the translated title and
   description of the current language plus the keywords; every query token
   must match (AND), and a label prefix outranks a word start, which outranks
   an inner match. Rows whose `requires` the runtime lacks are never returned.
   Embedded MPV rows depend on a lazy support probe
   (`ensureEmbeddedMpvSupportLoaded()`), run when the settings page or the
   command palette opens, never from shell bootstrap; frame copy also needs
   `frameCopyAvailable`, matching the settings page gate.
5. Settings routes use `local-filter` search mode, so the term lives in `q`.
   While `q` is set, the settings page shows ranked results in place of the
   section page and the settings context panel shows per-section match
   counts, muting sections without matches. The search box is shown on
   settings even when no playlist exists.
6. Choosing a result, pressing `Enter` in the header search (best match), or
   picking a settings command in the palette calls `reveal()`: it navigates
   to the section page without `q` (which clears the box) and the page
   scrolls to, focuses, and briefly highlights the row once the form is
   hydrated. A row hidden by the current form state falls back to its
   `fallbackId`, the control that makes it appear. A reveal must win over the
   typed term: `WorkspaceShellSearchSyncService` drops a keystroke still
   waiting for its debounce through `onReveal()`, and Enter does not apply
   the term first, because either `q` sync navigation would supersede the
   reveal navigation. Keyboard users keep a `:focus-visible` ring on the row
   after the highlight fades.
7. `Ctrl/Cmd+F` on settings focuses the header search instead of opening
   global search.

Keyboard shortcut help is shell-owned:

1. `WorkspaceKeyboardShortcutsService` is provided by `WorkspaceShellComponent`.
   It owns the workspace-scoped `document:keydown` listener for `?` /
   `Shift+/`.
2. The listener ignores events from inputs, textareas, selects, and
   content-editable elements via `isTypingInInput(...)`.
3. `libs/portal/shared/util/src/lib/keyboard-shortcut-definitions.ts` is the
   metadata registry for shortcuts shown in the help dialog and documented in
   README. `keyboard-shortcuts.ts` owns the display transformation and help
   trigger detection.
   Shortcuts that only work through the Electron bridge, such as embedded MPV
   controls, must set `electronOnly: true` so the PWA dialog does not advertise
   unavailable commands.
4. New custom shortcuts should be added to that registry when the handler is
   added. Do not include native browser/editor behavior such as `Tab` or
   platform text editing shortcuts.

## Window Chrome And Custom Title Bar

The Electron window hides the native title bar on all desktop platforms
(`titleBarStyle: 'hidden'` in `apps/electron-backend/src/app/app.ts`):

1. macOS keeps the native traffic lights (`titleBarOverlay: true`,
   `trafficLightPosition`); the renderer draws no window buttons.
2. Windows and Linux use renderer-drawn window controls
   (`app-window-controls`, `libs/ui/components/src/lib/window-controls/`).
   `frame` is intentionally left untouched so native resize borders and
   window snapping keep working.

The controls are mounted once in `app-root` (not inside the workspace
header) as a `position: fixed` top-right overlay so they stay clickable
above full-window content such as Material dialog backdrops — the same behavior as the macOS traffic lights. Because
CDK overlays render as popovers in the browser top layer (above any
z-index), the component host is itself a `popover="manual"` element: it
enters the top layer on init and re-enters it (hide + show) whenever
another popover opens, so the controls always paint last. The
`z-index: 10000` remains only as a fallback when the popover API is
unavailable. They render only when
`RuntimeCapabilitiesService.usesCustomWindowControls` is true (Windows/Linux
Electron with the window-control bridge methods available); the PWA and
macOS never mount them.

IPC contract (constants in `libs/shared/interfaces/src/lib/ipc-commands.ts`,
handlers in `apps/electron-backend/src/app/events/window.events.ts`):

1. `WINDOW:MINIMIZE`, `WINDOW:TOGGLE_MAXIMIZE`, `WINDOW:CLOSE`,
   `WINDOW:GET_STATE` are `ipcMain.handle` channels resolved from the sender
   WebContents. Close goes through `win.close()` so the existing
   window-bounds persistence in `app.ts` still runs.
2. `WINDOW:STATE_CHANGED` is pushed main → renderer on
   maximize/unmaximize and on the fullscreen events —
   `enter/leave-full-screen` plus the `enter/leave-html-full-screen`
   variants emitted for HTML-element fullscreen (video player
   fullscreen) — so the maximize/restore glyph stays correct for
   externally triggered changes (double-click on a drag region, OS
   snap, F11). The controls hide themselves while the window is
   fullscreen.

    Window state is **never re-read at event time**. `attachWindowStateEvents`
    seeds `{ isMaximized, isFullScreen }` once at window creation and each
    event patches only the flag it names; every push carries a copy of that
    tracked state. On Windows both getters can still report the
    pre-transition value while the matching event fires — `isFullScreen()`
    stays `true` during an HTML fullscreen exit, and `isMaximized()` reads
    `false` while the window is fullscreen. Because the renderer replaces
    both flags on every push and no later event corrects a stale one,
    polling left the controls hidden forever after leaving fullscreen and
    stuck the maximize/restore glyph on the wrong icon. Regression coverage:
    `app-window-state.spec.ts` and `window-controls.e2e.ts`.

    The pushed `isFullScreen` is the OR of two flags tracked apart: native
    (OS-level, fed by `enter/leave-full-screen`) and HTML-element (fed by
    the `*-html-*` pair). Electron remembers when the window was already
    natively fullscreen before the player entered HTML fullscreen and then
    leaves ONLY the HTML state on exit — no `leave-full-screen` fires and the
    window stays fullscreen — so a single flag cleared by
    `leave-html-full-screen` would un-hide the controls over a window that
    is still fullscreen. A fullscreen launch (below) or F11 followed by the
    player's `F` → `Esc` makes that path routine on Windows/Linux.

3. `WINDOW:TOGGLE_FULLSCREEN` toggles OS-level fullscreen (`setFullScreen`)
   and, like the maximize toggle, reports the requested state and leaves
   the `WINDOW:STATE_CHANGED` push authoritative. Because the transition is
   asynchronous — `isFullScreen()` reports the old value until it lands,
   and on Windows even while the matching event fires — a toggle must
   never be decided against the getter. Every native fullscreen request
   goes through the tracker in
   `apps/electron-backend/src/app/services/native-fullscreen-transitions.ts`
   (the F11 toggle AND the startup fallback below). Like the state pushes
   above it keeps its own per-window fullscreen state, seeded from the
   getter once at window creation (`trackNativeFullScreen` in
   `initMainWindow`, while no transition can be in flight) and fed
   afterwards only by the `enter`/`leave-full-screen` events, which also
   cover transitions the app did not request. A toggle is decided against
   the pending target while a transition is in flight, else against that
   tracked state: two quick presses are an enter-then-exit, not two enters,
   and F11 during the startup animation leaves fullscreen instead of asking
   for it again. The tracker observes and never issues a request on its
   own. The pending record is the LATEST requested target: an event landing
   on it clears it, an event landing on the other state (an earlier request
   of a burst landed first; ours is still queued) leaves it in place so the
   next press still follows the user's latest intent, and a record older
   than `FULLSCREEN_TRANSITION_TIMEOUT_MS` (2 s) is ignored. Events cannot
   say which request they belong to, so any automatic "repeat the target"
   on a mismatch is indistinguishable from reversing the user's own
   green-button/Ctrl+Cmd+F action and is deliberately not done: should a
   platform ever drop a queued request (Electron queues them on macOS and
   applies them synchronously elsewhere), the record expires, the event-fed
   state takes over and the next press corrects the window. The renderer
   binds it to
   **F11** in `WorkspaceKeyboardShortcutsService` (deliberately not gated
   by `isTypingInInput` — it must work from any focus, because it is the
   only exit from a fullscreen launch on Windows/Linux, where the title bar
   is hidden and the controls hide themselves) and skips the key while
   `document.fullscreenElement` is set, since the player's own `F` / `Esc`
   own HTML fullscreen and F11 must not yank OS fullscreen out from under
   it. Without a bridge (PWA) F11 is left to the browser.

Startup window mode (`Settings.startupWindowMode`, issue #1455):

1. `normal` (default) / `maximized` / `fullscreen`, chosen in Settings →
   General ("Window on startup"). Electron only — the select renders only
   when `RuntimeCapabilitiesService.supportsStartupWindowMode` sees both
   `updateSettings` and `toggleFullScreenWindow` on the bridge, so the mode
   is never offered without its F11 exit.
2. Settings live in the renderer's IndexedDB, which the main process cannot
   read at window creation, so the `SETTINGS_UPDATE` handler mirrors the
   value into electron-conf (`STARTUP_WINDOW_MODE`, the same pattern as the
   frame-copy flag) and `initMainWindow` reads it synchronously. A change
   therefore applies on the next launch. Both sides normalize through
   `normalizeStartupWindowMode`, so junk never reaches the config file or
   the window options.
3. `fullscreen` is the `BrowserWindow` constructor option: on Windows/Linux
   the window is created hidden and enters fullscreen before its first
   paint. macOS ignores the option while the window is hidden (an NSWindow
   only toggles fullscreen once it is on screen), so `ready-to-show` repeats
   the request with `setFullScreen(true)` right after `show()` wherever
   `isFullScreen()` is still false — never unconditionally, or the
   platforms that honoured the option would animate a second toggle. The
   saved bounds stay spread into the options — they are the normal bounds
   the window returns to, and the close handler keeps persisting
   `getNormalBounds()`. `maximized` calls `maximize()` inside
   `ready-to-show` right before `show()`, never earlier: `maximize()` on a
   hidden window shows it, and a blank window would flash.
4. `iptvnator --fullscreen` (read via `app.commandLine.hasSwitch`, so it can
   sit anywhere in argv; the playlist-path extractor already skips every
   `-`-prefixed argument) forces `fullscreen` for that launch only and is
   never persisted. Resolution lives in
   `apps/electron-backend/src/app/services/startup-window-mode.ts`. The
   switch is consumed by the first window (`launchFullscreenSwitchConsumed`
   in `App`): on macOS the process outlives its last window and the Dock
   re-creates it through the same `initMainWindow`, which must then follow
   the stored setting only. A second-instance launch carrying the switch is
   ignored — the window already exists.
5. Deliberately not offered: kiosk mode (removes the exit path) and
   "remember last state" (bounds persistence stores normal bounds only; an
   explicit choice is clearer). Regression coverage: `app.spec.ts`
   ("startup window mode"), `settings.events.spec.ts`,
   `window.events.spec.ts`, and the startup-window-mode cases in
   `settings.e2e.ts`.

Zoom level (Cmd/Ctrl and +/−/0, issue #1109):

1. The packaged renderer runs under `file://` with path routing. Chromium
   keys per-host zoom by the FULL URL when a URL has no host, so every
   `pushState` to another section owns a separate zoom entry: after a route
   change `webContents.getZoomLevel()` already reports that entry (usually
   0) and the next visual-properties sync — a window resize, a display
   change — snaps the renderer back to it. Chromium persists those per-URL
   entries in `Preferences` on its own, which is why the level used to
   "appear briefly" on `index.html` at startup and then reset. Dev mode
   (`http://localhost:4200`) is per-host and never shows this, so only a
   packaged or `ELECTRON_IS_DEV=0` run can verify zoom behaviour.
2. Restore therefore happens in the preload, not the main process:
   `applyPersistedZoomLevel` (`api/preload-zoom-level.ts`) asks for the
   stored level over the synchronous `WINDOW:GET_ZOOM_LEVEL` IPC at preload
   start and applies it with `webFrame.setZoomLevel`, which installs a
   TEMPORARY, frame-bound zoom level. It survives in-page navigation and
   resizes, the zoom shortcuts (point 4) step it through the same call, and
   `getZoomLevel()` reports it regardless of the route.
   `webContents.setZoomLevel` from the main process would write the per-URL
   entry and re-create the bug. When nothing is stored the preload re-applies
   the current level for the same reason: entering temporary mode makes the
   first zoom shortcut URL-independent too. A failed request is swallowed
   and only costs this load its restore.
   The apply is deferred to `DOMContentLoaded` — never at preload start and
   never from a `setTimeout`: on Linux and Windows a `webFrame.setZoomLevel`
   that early leaves the hidden window without a first frame, `ready-to-show`
   never fires, `show()` never runs, and the renderer gets no animation
   frames (the splash `main.ts` removes in a `requestAnimationFrame` stays).
   macOS is unaffected and CDP-driven tests force frames, so only the
   packaged Linux/Windows E2E asserting the splash is gone caught it
   (`legacy-playlist-migration.e2e.ts`, defer-epg). After the parser
   finishes the call is harmless and still lands before the first Angular
   paint. The preload then sends `WINDOW:ZOOM_LEVEL_APPLIED`.
3. Chromium never persists temporary zoom, so `services/window-zoom-level.ts`
   owns the electron-conf key `ZOOM_LEVEL`: the applied acknowledgement (not
   the request — between the two the sender's `getZoomLevel()` is still the
   per-URL default) marks the sender
   as owning the level, `persistZoomLevel` writes it back from the window
   `close` and app `before-quit` handlers (the bounds-only saves of before,
   folded into `persistWindowState`), and `attachZoomLevelPersistence` also
   writes it on every main-frame cross-document `did-start-navigation` —
   a reload drops the temporary level, and by `did-finish-load` the new
   document's preload has already read whatever was stored. That
   navigation also releases ownership until the next preload answers, so a
   close mid-reload cannot save the per-URL default over the user's level.
4. The shortcuts are a renderer key binding, not a native menu: the
   Windows/Linux window calls `setMenu(null)`, so no accelerator could reach
   it there. `WorkspaceKeyboardShortcutsService` (`libs/workspace/shell`)
   listens on the document like it does for F11 and resolves the chord with
   `resolveZoomShortcutAction` (`libs/portal/shared/util`): Cmd on macOS,
   Ctrl elsewhere, never Alt; `+`/`=` (so `Ctrl+=` and `Ctrl+Shift+=` both
   zoom in), `-`/`_`, `0`, and the numpad `+`/`-`/`0` (by `code`, since a
   NumLock-off `0` reports `Insert`). Keys are matched by `event.key`, so
   non-US layouts zoom with their own `+`/`-` keys. Like F11 it is not gated
   by the typing-target check — browsers zoom from any focus — and a key
   another handler already `preventDefault`ed is left alone. The binding
   calls the synchronous, preload-local `window.electron.adjustZoomLevel`
   (`adjustFrameZoomLevel` in `api/preload-zoom-level.ts`), which steps the
   frame's temporary level through the same `webFrame.setZoomLevel` as the
   restore and returns the level applied — never a main-process
   `webContents.setZoomLevel`, which would re-create the per-URL bug. The
   step and limits live in `libs/shared/interfaces/src/lib/zoom-level.util.ts`
   (`stepZoomLevel`): 0.5 per press, Electron's own `zoomIn`/`zoomOut` role
   step (≈10 %), clamped to levels −4…6 (≈48 %…299 %, inside Chromium's
   25–500 %), off-grid levels snapping to the next grid point in the pressed
   direction; `Ctrl/Cmd+0` returns to level 0. A stored level already
   outside the limits (the macOS menu roles never clamped) is never moved
   against the request: a press further out leaves it, a press back in
   lands on the limit. Persistence needs nothing
   extra: the main process reads the live level back (point 3). On macOS the
   default application menu still carries the `zoomIn`/`zoomOut`/`resetZoom`
   roles, but Chromium hands a key equivalent to the web contents first and
   Electron performs the menu equivalent only in
   `WebContents::PlatformHandleKeyboardEvent`
   (`shell/browser/api/electron_api_web_contents_mac.mm`, Electron 43.3.0),
   the unhandled-keyboard-event hook — a `preventDefault`ed keydown never
   gets there, so the binding keeps one press at one step. CDP-dispatched
   keys (the E2E) never reach the menu at all.
   Without a bridge (PWA) the browser keeps its own zoom, and the help
   dialog lists the chords as Electron-only. Regression coverage:
   `window-zoom-level.e2e.ts` presses the real shortcuts (in, out, numpad,
   reset) and measures the rendered factor (content width ÷
   `window.innerWidth`) across a section change, a resize, a reload and a
   restart; key resolution and the bridge step are unit-tested in
   `keyboard-shortcuts.spec.ts`, `workspace-keyboard-shortcuts.service.spec.ts`
   and `preload-zoom-level.spec.ts`.

Reloading the renderer on an in-app route:

1. The packaged renderer is `dist/apps/web/index.html` over `file://` and
   Angular routes by path (no hash strategy), so once the user is on a
   section the document URL is `file:///…/web/workspace/sources` — a path
   with no file behind it. A reload of that URL fails with
   `ERR_FILE_NOT_FOUND` (-6) or is cancelled outright, depending on who
   starts it. Two user-reachable triggers: the macOS default application
   menu (nothing calls `Menu.setApplicationMenu`, so View › Reload / Force
   Reload are live; Windows/Linux drop the menu bar via `setMenu(null)`),
   and the settings unsaved-changes guard, which calls
   `window.location.reload()` after the user confirms a reload intent on
   `/workspace/settings/<section>`. Dev mode (`http://localhost:4200`) never
   shows either — the dev server serves the index for every path.
2. Both legs live in `services/renderer-reload-fallback.ts` and end in the
   same `restoreRendererRoute`: load the packaged index with the routed
   URL's route — its path relative to the renderer root plus query and
   fragment (`resolveRoutedRendererUrl`) — in the `restoreRoute` query
   parameter.
    - A main-process reload (`webContents.reload()`, the menu role,
      DevTools) fires no `will-navigate`, so it cannot be redirected up
      front: it fails, Chromium commits `chrome-error://chromewebdata/`
      and `app-root` stays empty until the app restarts.
      `attachRendererReloadFallback` recovers it after the fact from the
      main-frame `did-fail-load` with `ERR_FILE_NOT_FOUND`
      (`resolveReloadedRendererRoute`); other error codes, subframes and
      non-`file:` URLs are left alone. The recovery load is deferred to
      the error page's `dom-ready` and never issued from inside
      `did-fail-load`: a `loadFile` started while Chromium is still
      committing the error page yields a document that never receives
      animation frames — the splash stays, nothing paints, while
      `document.visibilityState` still says `visible` — and the same load
      after `dom-ready` paints normally (Electron emits `did-fail-load`
      before that `dom-ready`). A cross-document navigation starting in
      between withdraws the pending recovery, so a stale `dom-ready` can
      never re-load the index over a newer navigation.
    - A renderer-initiated reload (`location.reload()`, the settings
      guard) does fire `will-navigate`, where the routed URL is not the
      trusted index and `handleRendererNavigation` would cancel it —
      silently, so the confirmed reload simply never happened. The handler
      now recognizes a routed renderer URL and sends it straight to the
      index with its route, with no failed load in between; every other
      untrusted navigation is still blocked (external URLs still open in
      the browser).
   A failed `index.html` itself is never re-requested (it would loop):
   `resolveRoutedRendererUrl` rejects the index, and the recovery load
   carries `index.html` as its path, so a second failure cannot recurse.
3. The renderer consumes the parameter before Angular bootstraps:
   `apps/web/src/main.ts` calls `resolveRestoredRendererRoute`
   (`libs/shared/interfaces/src/lib/renderer-reload-route.util.ts`, which
   also owns the parameter name) and installs the result with
   `history.replaceState`, so the router's initial navigation lands on the
   route the user was on. The route is resolved against `document.baseURI`
   (the packaged `<base href="./">`, i.e. the renderer directory — the same
   prefix Angular strips from `location.pathname`), and anything that would
   leave that directory (an absolute URL, another scheme, a `..` escape)
   is dropped with only the parameter removed, so the app boots at its
   default route instead of following an arbitrary target.
4. Zoom persistence is unaffected: the failed reload's
   `did-start-navigation` already saved the level and released ownership,
   the recovery load's `did-start-navigation` is then a no-op, and the new
   document's preload restores the level as after any other reload. The
   main-process close guard also treats the recovery like any full
   navigation (`did-navigate` disarms it).
5. Regression coverage: `renderer-reload.e2e.ts` reloads from the main
   process (`webContents.reload()`, the menu role) on Sources and from the
   renderer (`window.location.reload()`, the settings guard) on a settings
   section and asserts a NEW document is rendered on the same route with
   the parameter gone (`renderer-reload.support.ts` marks the old document,
   since the URL alone is identical before and after);
   `window-zoom-level.e2e.ts` reloads the same way. Unit coverage:
   `renderer-reload-fallback.spec.ts`, `renderer-reload-route.util.spec.ts`,
   `app.spec.ts` ("renderer reload recovery").

Layout integration:

1. `document.body` gets a `frameless-platform` class (set in
   `AppComponent`, same mechanism as `dark-theme`) — body-level so rules
   also reach cdk-overlay content rendered outside `app-root`.
2. `apps/web/src/styles.scss` reserves `padding-right: 150px` in
   the top-aligned drag region (`.workspace-header`) for the 3 × 46px
   button strip.
3. Button colors follow the theme via CSS variables (`--app-on-surface`,
   `--app-hover-overlay`); the close button uses the Windows-style red
   hover (`#e81123`). No theme IPC is involved.

Window decorations on Linux (shadows, corners):

1. Hiding the title bar removes the window manager's decorations, so the
   shadow/rounded corners must come from client-side decorations (CSD).
   Electron 43 enables rounded corners by default when the Linux desktop
   environment supports CSD. GTK drop shadows and extended resize boundaries
   remain environment-dependent; Electron selects native Wayland automatically
   on Wayland sessions.
2. Linux environments without CSD support can still show a square,
   undecorated window. Windows 11 keeps its DWM rounded corners and shadow
   because the standard frame is retained.

Toolchain notes for the Electron 43 baseline:

1. `better-sqlite3` remains pinned exactly so native dependency updates happen
   deliberately with database-worker, packaging, and Electron E2E validation.
   Version 13 uses Node-API and ships its supported platform binaries in the
   package. It must not be listed in pnpm's `onlyBuiltDependencies`: forcing an
   implicit `node-gyp rebuild` bypasses those binaries and makes installation
   depend on the host compiler toolchain. The old `node-abi` override belonged
   to v12's removed `prebuild-install` path and is no longer required.
2. Local development supports **Node 22.22.3–22.x or 24.15.0–24.x**, declared in
   `engines` as `^22.22.3 || ^24.15.0`. Use `.nvmrc` (currently 22.23.2) for
   development and CI. Angular 22 sets this supported LTS range and requires
   TypeScript `>=6.0 <6.1`. `electron-builder` 26.15.7 also pulls `@electron/rebuild` 4,
   which requires Node 22.12 or newer, and the root `postinstall` runs
   `install-app-deps` on every `pnpm install`. The 26.15.7 minimum also
   carries the v26 backport that fully extracts the Snap template's `.tar.7z`
   payload; 26.15.0–26.15.6 can
   produce a Snap that is missing `desktop-init.sh`.
3. Dependabot keeps Electron, native database, packaging, EPG parser, and
   version-locked Shaka/mpegts updates out of the shared npm minor/patch group.
   Those dependencies require standalone PRs so their dedicated package,
   worker, playback, and diagnostic-contract validation cannot be hidden by an
   unrelated grouped update.
4. Electron 42 and newer download their development binary on the first
   Electron command instead of during package `postinstall`, so `electron`
   must not remain in pnpm's `onlyBuiltDependencies` allowlist. The first local
   `pnpm run serve:backend` can include a one-time download; use `pnpm exec
electron --version` to prewarm it before an offline run.

Known caveats:

1. DIY buttons cannot show the Windows 11 Snap Layouts flyout (only native
   caption buttons or the Window Controls Overlay get that).
2. Double-click-to-maximize on drag regions is handled natively by
   Electron/Chromium; on Linux the exact behavior depends on the window
   manager.

## Maintenance Guidance

Use this document as the source of truth when changing workspace shell behavior.

1. New top-level user destinations should default to child routes under
   `/workspace`.
2. Shared provider navigation logic belongs in portal-shared util/UI libraries,
   not duplicated inside the shell.
3. If a provider route changes how playlist/session bootstrap works, update the
   route-session provider and shell-facing route contract together.
4. When adding a non-native keyboard shortcut, update the shared shortcuts
   registry, the help dialog tests, README, and the closest behavior test.
5. Historical migration notes, cleanup lists, and one-off refactor steps should
   stay out of this file; track them in issues or PR notes instead.