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>

libs/workspace/shell/util/src/lib/settings-context.service.ts

@@ -16,12 +16,25 @@ export interface SettingsNavItem {
 @Injectable({ providedIn: 'root' })
 export class SettingsContextService {
     readonly sections = signal<SettingsNavItem[]>([]);
+    /**
+     * Settings search matches per section id while a search term is active,
+     * `null` otherwise. The panel shows the counts and mutes sections
+     * without matches.
+     */
+    readonly matchCounts = signal<Readonly<Record<string, number>> | null>(
+        null
+    );
 
     setSections(items: SettingsNavItem[]): void {
         this.sections.set(items);
     }
 
+    setMatchCounts(counts: Readonly<Record<string, number>> | null): void {
+        this.matchCounts.set(counts);
+    }
+
     reset(): void {
         this.sections.set([]);
+        this.matchCounts.set(null);
     }
 }