feat(settings): search settings from the header and the command palette (#1714)

* feat(settings): search settings from the header and the command palette

The header search on the Settings page was shown but disabled. It now
searches a shared index of all 56 settings rows by translated title,
description and English synonyms, replaces the section page with ranked
results, and opens a result by scrolling to, focusing and briefly
highlighting its row. Enter opens the best match, and the section
navigation shows per-section match counts.

The command palette gains a "Settings" group that lists the best six
matches for a non-empty query, so any setting is one Ctrl/Cmd+K away.
Rows hidden by the current form state fall back to the control that
reveals them; rows the runtime cannot render are never returned.

The index ships through a new @iptvnator/workspace/shell/util/settings-search
sub-entrypoint so it stays out of the eager bundle, and a registry spec
keeps it in step with the section templates.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(settings): let search reveals win over pending input and gate embedded MPV rows

- A reveal (result click, command palette, Enter) now cancels a search
  keystroke still waiting for its debounce, so its q navigation can no
  longer supersede the reveal and leave the results open.
- Embedded MPV extra options and auto-reconnect require a lazily probed
  embedded MPV capability; frame copy also needs frameCopyAvailable, so
  search never offers a row the settings page cannot render.
- Keyboard users keep a focus-visible ring on the revealed row after the
  highlight fades.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(workspace): wait for palette probes without Promise.allSettled

The web tsconfig lib predates Promise.allSettled; use Promise.all over
rejection-safe probes instead.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: 4gray <fourgray@proton.me>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -60,7 +60,8 @@ The application is a cross-platform, open-source project built with Electron and
 
 - Per-playlist and global favorites, aggregated across all playlists ⭐
 - Recently viewed / watch history
-- Command palette (`Ctrl/Cmd+K`)
+- Command palette (`Ctrl/Cmd+K`) that also finds and opens individual settings
+- Settings search from the header search box on the Settings page
 
 **Platform**
 
@@ -76,9 +77,9 @@ Press `?` or `Shift+/` in the workspace to open the in-app shortcuts list.
 | Area              | Shortcut                    | Action                                                     |
 | ----------------- | --------------------------- | ---------------------------------------------------------- |
 | Global            | `Ctrl/Cmd+K`                | Open command palette                                       |
-| Global            | `Ctrl/Cmd+F`                | Open global search in the desktop app                      |
+| Global            | `Ctrl/Cmd+F`                | Open global search (desktop); on Settings, search settings |
 | Global            | `Ctrl/Cmd+R`                | Open recently viewed in the desktop app                    |
-| Global            | `Enter` in workspace search | Submit the current search                                  |
+| Global            | `Enter` in workspace search | Submit the search; on Settings, open the best match        |
 | Global            | `F11`                       | Toggle app window fullscreen in the desktop app            |
 | Navigation        | `Ctrl/Cmd+B`                | Toggle the live sidebar                                    |
 | Navigation        | `0-9`                       | Select an M3U channel by number                            |