Android 0.2.4 — Custom color, gradient & photo themes beta

MeshCrossway Android 0.2.4 — Appearance themes beta

New: Settings → Appearance & colors lets you choose:

• System: follow Android light/dark appearance
• Color: solid color with adjustable hue and color swatches
• Gradient: adjustable linear or mesh gradient backgrounds
• Photo: choose a photo on the phone, adjust dim and blur. The app stores a local, re-encoded, EXIF-stripped private copy; no upload is made.

Theme preferences and the private photo remain saved in the same app storage and survive normal in-place Android APK updates. The remote computer/browser UI has its own separate visual appearance at present.

Important: This APK is signed with the EXACT same long-lived signing key and same app package as Android 0.2.3 (versionCode 14). To preserve messages, saved radios, favorites, track recordings and downloaded offline maps, install it over your existing 0.2.3 app; do not uninstall, clear app data or install a debug-signed APK.

Meshtastic radio identity remains orange and MeshCore remains blue. The existing independent dual BLE messaging, optional HTTPS browser workspace, offline maps and tracks are unchanged by this theme update.

The app's portable full ZIP backup stores theme preferences but not a custom background photo image; a full uninstall would remove the latter. Re-select the photo after a fresh reinstall if necessary.

Validation: Android source CI run passed build/lint and Android API 29/35 emulator smoke tests including persistent appearance settings and photo loading. See PR #197. Real phone visual checks of all four themes remain required. Public beta, not production version 1.0.

APK SHA-256 and permanent certificate fingerprint are attached separately.