chore: release 0.3.1 — iOS PWA fixes, notification improvements, docs update

- fix(pwa): iOS keyboard gap caused by WebKit viewport-fit=cover bug.
  After keyboard open/close, 100dvh permanently shrinks. Track max
  innerHeight in --app-height CSS variable as stable replacement.
- feat(pwa): auto-prompt notification permission on first login in
  standalone mode (once only, skips if denied).
- refactor: remove duplicate notification toggle from header menu
  (already in Settings).
- feat(dev): expose Vite dev server on network (host: true) for
  mobile testing via Tailscale.
- docs: update README — add Task Progress FAB, fix notification
  flow description, document OPENAI_API_KEY / VAPID_EMAIL env vars,
  clarify voice input backends, add CLI --version/--help, update
  .env.example.

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

README.md

@@ -41,6 +41,8 @@ clawtap
 
 Open the URL on your phone. That's it.
 
+> **Mobile access?** ClawTap needs HTTPS for PWA install and push notifications. The easiest way is [Tailscale](https://tailscale.com): `tailscale serve --bg 3456` gives you a trusted HTTPS URL instantly. See [PWA & Push Notifications](#-pwa--push-notifications) for details.
+
 ClawTap auto-detects which AI CLIs you have installed (`claude`, `codex`, `gemini`) and enables them automatically.
 
 <details>
@@ -124,9 +126,16 @@ Every tool call renders as an expandable card:
 
 Send follow-up messages while the AI is still responding. They appear as "Queued" with Edit/Cancel and auto-send when the AI finishes. Paste images from clipboard with thumbnail preview.
 
+### Task Progress
+
+When your AI creates tasks (via `TaskCreate`/`TaskUpdate`), a floating progress ring appears in the bottom-right corner showing completion (e.g., 2/5). Tap it to expand a bottom sheet with full task details. Tasks are grouped by rounds — a new round starts when all previous tasks complete. The ring auto-fades 3 seconds after all tasks finish.
+
 ### Voice Input
 
-Tap the mic icon to dictate coding instructions. Uses the Web Speech API with real-time interim transcription. Works in any language.
+Tap the mic icon to dictate coding instructions. Supports two backends:
+
+- **Web Speech API** (default) — real-time interim transcription, currently configured for Traditional Chinese (`zh-TW`)
+- **OpenAI Whisper** — higher accuracy, requires `OPENAI_API_KEY` (see [Configuration](#-configuration))
 
 ### Smart Input
 
@@ -151,6 +160,8 @@ clawtap hooks install [--adapter claude]   # Install hooks (all or one adapter)
 clawtap hooks uninstall [--adapter gemini] # Remove hooks
 clawtap cert                               # Generate HTTPS certificate
 clawtap stop                               # Graceful shutdown
+clawtap --version                          # Show version
+clawtap --help                             # Show help
 ```
 
 The `--adapter` flag works with every command. Session lists show colored `[Claude]`/`[Codex]`/`[Gemini]` labels with first-prompt previews.
@@ -175,7 +186,7 @@ clawtap cert
 
 **2. Install PWA:** Open the URL in Safari → Share → **Add to Home Screen**.
 
-**3. Enable notifications:** Open ClawTap from home screen → tap the **bell icon** → Allow.
+**3. Enable notifications:** On first login in standalone mode, ClawTap automatically prompts for notification permission. You can also toggle notifications manually in **Settings**.
 
 ### Smart Notifications
 
@@ -195,6 +206,8 @@ The app icon badge shows how many sessions have unread notifications. Entering a
 |----------|---------|-------------|
 | `CLAWTAP_PASSWORD` | *(required)* | Login password |
 | `PORT` | `3456` | Server port |
+| `OPENAI_API_KEY` | *(optional)* | Enables Whisper voice transcription (higher accuracy than Web Speech API) |
+| `VAPID_EMAIL` | `noreply@clawtap.local` | Contact email for Web Push VAPID identification |
 
 HTTPS is enabled automatically when `~/.clawtap/cert.pem` and `~/.clawtap/key.pem` exist. Otherwise the server runs on HTTP. Tailscale Serve is the easiest path to HTTPS.