Add emulator and device connection notes to state.md

Documents how to launch the Pixel_3a_API_35 AVD via start-avd, and
the wireless ADB pairing workflow for the Pixel 7a.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

state.md

@@ -73,13 +73,46 @@ Element Web (`e6CqkKos`) keeps sending `BAD_MESSAGE_KEY_ID` PRE_KEY messages. Th
 
 ```bash
 nix develop -c gradle --no-daemon assembleDebug
+
+# Emulator
 adb install -r app/build/outputs/apk/debug/app-debug.apk
+
+# Pixel 7a (wireless)
+adb -s 192.168.1.101:45201 install -r app/build/outputs/apk/debug/app-debug.apk
 ```
 
 `adb install -r` preserves user data. Use `logout()` in-app to wipe crypto state.
+Full wipe: `adb shell pm clear com.ltadeu6.matrix`
 
 To send a test message from matrix-commander:
 ```bash
 nix develop -c matrix-commander --credentials .mc/credentials.json --store .mc/store \
   -m "test message" --room '!rNfgFvyFMQEWIQnYVV:matrix.org'
 ```
+
+## Emulator
+
+AVD name: `Pixel_3a_API_35`, ADB serial: `emulator-5554`.
+
+```bash
+nix develop
+start-avd             # defined in flake.nix shellHook; creates AVD on first run
+adb wait-for-device   # wait for boot
+```
+
+`start-avd` uses system image `system-images;android-35;google_apis;x86_64` and launches with `-no-snapshot-load`.
+
+## Physical devices
+
+### Pixel 7a (wireless ADB)
+
+IP: `192.168.1.101`, ADB serial: `192.168.1.101:45201`.
+
+Ports change every time wireless debugging is toggled — re-pair if connection drops.
+
+**Connect workflow:**
+1. Phone: Settings → Developer options → Wireless debugging → enable
+2. Tap **"Pair device with pairing code"** — note the pairing IP:port and 6-digit code
+3. `adb pair <pairing-ip>:<pairing-port>` → enter code when prompted
+4. `adb connect <ip>:<connect-port>` (connect port is on the main Wireless debugging screen, different from pairing port)
+5. Verify: `adb devices`