fix: voice input in Electron - local Whisper STT + network error handling

- Add local Whisper STT via Transformers.js with Web Worker (no UI freeze)
- Default sttProvider to 'local' in Electron (browser STT unavailable)
- Fix infinite toast loop: stop auto-restart on network errors
- Add retry limit with exponential backoff for transient STT errors
- Append voice transcript to input field (append-inline), not replace
- Add model catalog with download/load button in Voice Settings

package.json

@@ -68,17 +68,18 @@
     "release:test:arm": "./scripts/test-release-build.sh aarch64"
   },
   "dependencies": {
+    "@base-ui/react": "^1.4.0",
     "@codemirror/autocomplete": "^6.20.0",
     "@codemirror/commands": "^6.10.1",
+    "@codemirror/lang-cpp": "^6.0.3",
     "@codemirror/lang-css": "^6.3.1",
+    "@codemirror/lang-go": "^6.0.1",
     "@codemirror/lang-html": "^6.4.11",
     "@codemirror/lang-javascript": "^6.2.4",
     "@codemirror/lang-json": "^6.0.2",
     "@codemirror/lang-markdown": "^6.5.0",
     "@codemirror/lang-python": "^6.2.1",
     "@codemirror/lang-rust": "^6.0.2",
-    "@codemirror/lang-cpp": "^6.0.3",
-    "@codemirror/lang-go": "^6.0.1",
     "@codemirror/lang-sql": "^6.10.0",
     "@codemirror/lang-xml": "^6.1.0",
     "@codemirror/lang-yaml": "^6.1.2",
@@ -96,7 +97,6 @@
     "@lezer/highlight": "^1.2.3",
     "@octokit/rest": "^22.0.1",
     "@opencode-ai/sdk": "^1.4.48",
-    "@base-ui/react": "^1.4.0",
     "@radix-ui/react-collapsible": "^1.1.12",
     "@radix-ui/react-dialog": "^1.1.15",
     "@radix-ui/react-dropdown-menu": "^2.1.16",
@@ -107,6 +107,7 @@
     "@radix-ui/react-toggle": "^1.1.10",
     "@radix-ui/react-tooltip": "^1.2.8",
     "@types/react-syntax-highlighter": "^15.5.13",
+    "@xenova/transformers": "^2.17.2",
     "bun-pty": "^0.4.5",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",