feat: PineVoice Improv-BLE WiFi provisioning page

Local Web Bluetooth page that provisions the Pine64 PineVoice speaker over
the Improv BLE protocol. Waits for the AUTHORIZED state before sending
credentials (per the Improv spec), uses write-with-response since the
firmware declares the RPC characteristic write-only, and logs the device
state/error sequence for diagnostics.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

ha-stack.yml

@@ -0,0 +1,27 @@
+# Home Assistant + Wyoming voice pipeline for the PineVoice speakers.
+# Deploy as a Portainer stack (inside the Umbrel Portainer DinD).
+# /data/ paths persist across reboots (map to ~/umbrel/app-data/portainer/data/docker/).
+services:
+  homeassistant:
+    image: homeassistant/home-assistant:2026.7.1
+    restart: unless-stopped
+    ports:
+      - "8123:8123"
+    environment:
+      - TZ=Europe/London
+    volumes:
+      - /data/homeassistant:/config
+
+  whisper:
+    image: rhasspy/wyoming-whisper:3.4.1
+    restart: unless-stopped
+    command: --model base-int8 --language en
+    volumes:
+      - /data/wyoming-whisper:/data
+
+  piper:
+    image: rhasspy/wyoming-piper:2.2.2
+    restart: unless-stopped
+    command: --voice en_GB-alba-medium
+    volumes:
+      - /data/wyoming-piper:/data