feat(web): PillNav bar mode, fullscreen, local STT + mic button

PillNav overhaul:
- Dropdown-as-bar: theme/AI/sync/user menus render as horizontal
  bars in the bottom stack (PillDropdownBar) instead of floating
  popovers. New onOpenBar/activeBarId props on PillNavigation.
- iconOnly pills: tags/search/workbench-tabs pills show only icons.
  Home pill removed. New iconOnly flag on PillNavItem.
- Segmented toggle groups: items sharing a `group` id render as a
  single segmented pill (e.g. Light/Dark/System triple).
- Fullscreen mode: press "f" to hide all bottom chrome, Esc to exit.
- QuickInputBar + bottom bar visibility toggles via new pills.
- Progress ring on AI trigger pill during model download
  (conic-gradient ::after, follows pill border-radius).

@mana/local-stt — new package for browser-local speech-to-text:
- Whisper models via transformers.js v4 (WebGPU + WASM fallback)
- Same Web Worker architecture as @mana/local-llm
- Two models: Whisper Tiny (150 MB) and Whisper Small (950 MB)
- Reactive Svelte 5 bindings (getLocalSttStatus, loadLocalStt, transcribe)

Voice-to-text integration:
- useLocalStt() composable: mic capture via AudioContext +
  ScriptProcessor, resample to 16kHz mono, feed into Whisper worker
- Mic button in QuickInputBar (leftAction slot) with
  recording/loading/transcribing states + pulse animation
- Transcribed text injected into InputBar via new injectedText prop
- STT model selector in AI bar alongside LLM tier controls

Also: vite.config.ts server.fs.allow expanded to monorepo root
so workspace package workers resolve in dev.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/shared-ui/src/quick-input/InputBar.svelte

@@ -76,6 +76,9 @@
 		locale?: string;
 		/** Use 'static' when inside a flex container (bottom-stack pattern). Default: 'fixed'. */
 		positioning?: 'fixed' | 'static';
+		/** Externally injected text (e.g. from voice input). When this changes
+		 *  to a non-empty string, the input bar's query is set and focused. */
+		injectedText?: string;
 	}
 
 	let {
@@ -106,6 +109,7 @@
 		highlightPatterns,
 		locale = 'de',
 		positioning = 'fixed',
+		injectedText,
 	}: Props = $props();
 
 	// Use settings for autoFocus
@@ -125,6 +129,18 @@
 	// Whether search has been explicitly triggered in deferred mode
 	let searchTriggered = $state(false);
 
+	// External text injection (e.g. from voice-to-text). When the prop
+	// changes to a new non-empty value, set the search query and focus.
+	let lastInjected = '';
+	$effect(() => {
+		if (injectedText && injectedText !== lastInjected) {
+			lastInjected = injectedText;
+			searchQuery = injectedText;
+			// Focus the input so the user sees and can edit the text
+			requestAnimationFrame(() => inputElement?.focus());
+		}
+	});
+
 	// Context menu state
 	let contextMenuVisible = $state(false);
 	let contextMenuX = $state(0);