fix(player): keyboard focus, contrast and ARIA for controls and settings

Dock and settings-panel icon buttons draw a 2px --pc-text ring on
:focus-visible, and Material's theme-coloured focus layer is off, so
keyboard focus shows on video in the light theme too. A focused selected
subtitle swatch now differs from one that is only selected.

Settings headings read --pc-text-secondary on denser glass
(--pc-glass-bg-dense, 0.86): 4.5:1 or more over mid-grey and white
frames. They wrap (overflow-wrap: anywhere, hyphens: auto), so long
German and Russian headings stay inside the sheet's heading column.

The settings panel is now radio groups only (SettingsRadioGroupDirective
over a CDK FocusKeyManager): one Tab stop per group on the checked option,
arrows, Home and End move focus without applying, and Space/Enter checks.
The dialog and its groups are named by real h2/h3/h4 headings, the
load-file action sits outside the subtitle radio group, the subtitle and
speed chips carry their value in their name ("Subtitles: English"), and
tune has aria-haspopup="dialog".

Adds a web E2E for the keyboard path in both themes with an axe check on
the open panel, and de/ru sheet heading wrapping; axe-core is a new dev
dependency for it.

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

docs/architecture/iptvnator-ui-guidelines.md

@@ -91,7 +91,9 @@ themes and fullscreen; frame-copy and built-in shared controls keep their
 light-on-dark overlay palette — the fixed `--pc-*` token set of the shared
 dock (accent blue, cyan, violet, the `--pc-live` / `--pc-danger` reds and a
 light text ramp), never the app theme. The overlay styles in
-`player-controls/` never read a `--mat-sys-*` token.
+`player-controls/` never read a `--mat-sys-*` token, and their keyboard focus
+is a 2px `--pc-text` outline rather than Material's theme-coloured focus layer
+(`player-controls-keyboard.e2e.ts` checks it in both themes).
 
 EPG timeline, list, empty states and programme details use the library-local
 `libs/ui/epg/src/lib/_epg-theme.scss` palette, based on app surfaces, separators,

docs/architecture/player-controls-contract.md

@@ -297,7 +297,8 @@ It owns only transient presentation behavior:
 - `ControlsSettings` — the settings panel's groups, on/modified state and
   open/close transitions (`controls-settings-groups.ts` holds the pure
   group-availability rule);
-- `app-player-settings-panel` — the panel / bottom sheet presentation;
+- `app-player-settings-panel` — the panel / bottom sheet presentation,
+  whose radio groups use `settings-radio-group.directive.ts`;
 - `ControlsUpNext` and `app-player-up-next-card` — the "Up next" card's
   gate and presentation; and
 - `controls-view-model.ts` — derived display state.
@@ -346,7 +347,11 @@ app's `--app-selection-color` is a different blue that would fight the video.
   measured below 3:1 against the lighter fills.
 - **Icon buttons** are 40px with a 12px radius (32px / 9px compact) through
   Material's `--mat-icon-button-*` tokens; their hover is a flat
-  `rgba(255,255,255,.1)` layer.
+  `rgba(255,255,255,.1)` layer. Keyboard focus draws a 2px `--pc-text`
+  outline (`:focus-visible`), and Material's focus state layer is switched
+  off: its colour comes from the app theme, and the light theme's dark layer
+  left no visible focus on video. The settings panel's icon buttons use the
+  same ring, inset by 2px because the panel body clips at its edge.
 
 ### Timeline segments
 
@@ -442,7 +447,10 @@ the panel the moment the last group disappears.
 
 - **Roomy wide dock** (≥ 960px): two **value chips** precede `tune` — subtitles
   (`closed_caption` + the selected track's label, or "Off") and speed
-  (`speed` + `1.25×`). Audio and aspect ratio have no chip: they are
+  (`speed` + `1.25×`). A chip's accessible name and tooltip carry its
+  value (`SUBTITLES_TOOLTIP` "Subtitles: English", `SPEED_TOOLTIP`
+  "Speed: 1.25×"); `tune` has `aria-haspopup="dialog"` and
+  `aria-expanded`. Audio and aspect ratio have no chip: they are
   panel-only. A chip click opens the panel **focused on its group**
   (`settingsFocus`; the group scrolls into view and wears a brief ring);
   right-click or long-press on the subtitle chip toggles subtitles without
@@ -460,12 +468,30 @@ the panel the moment the last group disappears.
   picture and recording stay in the compact dock — the mock shows only
   `tune` + fullscreen there, but those two are engine features a viewer
   needs without opening anything.
-- **Inside**: list groups (audio, subtitles, quality) use `menuitemradio`
-  rows with a check mark and a cyan selection; segmented groups (speed,
-  aspect) use `radio` items with a violet selection, and a selected default
-  (`1×`, the first aspect preset) stays neutral. The subtitle group carries
-  the load-file action and the delay / size / color sections that the
-  popover used to hold (same `player-controls-load-subtitle`,
+- **Inside**: every choice is a `radio` in a `radiogroup`
+  (`SettingsRadioGroupDirective` / `SettingsRadioDirective`). List groups
+  (audio, subtitles, quality) are rows with a check mark and a cyan
+  selection; segmented groups (speed, aspect, subtitle size) have a violet
+  selection, and a selected default (`1×`, the first aspect preset) stays
+  neutral. Each group is one Tab stop — the checked option, else the first —
+  and arrows, Home and End move focus with a CDK `FocusKeyManager`
+  (wrapping; the horizontal arrows follow `direction`). Moving focus does not
+  apply: a choice is applied to the playing stream at once and a track or
+  quality switch rebuffers, so Space / Enter checks, as in a toolbar radio
+  group. Focus changes also write the roving `tabindex` immediately, because
+  a quick Shift+Tab, Tab can arrive before change detection updates the
+  bindings. The dialog is named by its `h2` title (`aria-labelledby`), each
+  radio group by its `h3` group heading or `h4` subheading, and the delay
+  buttons form a labelled `group`. Headings read `--pc-text-secondary` on
+  `--pc-glass-bg-dense` (`rgba(12,16,23,.86)`), 4.5:1 or more even over a
+  white frame. They wrap with `overflow-wrap: anywhere` and `hyphens: auto`,
+  so one long word (German "Wiedergabegeschwindigkeit") breaks inside the
+  sheet's 84px heading column. Hyphenation needs a `lang` on `<html>`.
+  Every focused option shows the `--pc-text` ring; a selected swatch has a
+  white border with a dark inner gap, and focus adds an outer ring. The
+  subtitle group carries the load-file action (a plain button outside the
+  radio group) and the delay / size / color sections that the popover used
+  to hold (same `player-controls-load-subtitle`,
   `player-controls-subtitle-delay`, `player-controls-subtitle-style` test
   ids). The panel is a `role="dialog"` with `tabindex="-1"`: opened from
   the keyboard (the opener is `:focus-visible`) it takes focus, a pointer
@@ -1613,6 +1639,7 @@ libs/ui/playback/src/lib/player-controls/
 ├── player-settings-panel.component.ts
 ├── player-settings-panel.component.html
 ├── player-settings-panel.component.scss
+├── settings-radio-group.directive.ts
 ├── controls-fullscreen.ts
 ├── controls-menu-selection.ts
 ├── controls-menu-state.ts