Declare app version per channel and fix Android live updates

- Add channel.appVersion and an appPackage override so pure builds bake the pinned version instead of RadiantWave's 0.1.0 default.

- Pin the radiantwave input to tag 1.8 and allow unfree in the RPi builder to match x86.

- radiantwaveUpdaterModule gains a manifestFile arg; Raspberry Pi polls aarch64-manifest.json.

- Launch the rotated/Android kiosk through /var/lib/radiantwave/current so the live updater actually applies.

rotated_display.nix

@@ -1,6 +1,13 @@
-{ pkgs, radiantwave, ...}:
+{ config, pkgs, radiantwaveApp, ...}:
 let
-  radiantApp = radiantwave.packages.${pkgs.system}.default;
+  radiantApp = radiantwaveApp;
+  # Match configuration.nix: when the live updater is enabled, launch through
+  # the mutable /var/lib/radiantwave/current pointer so Android kiosks receive
+  # app updates instead of always running the baked baseline.
+  launchBin =
+    if config.services.radiantwaveUpdater.enable or false
+    then "/var/lib/radiantwave/current/bin/radiantwave"
+    else "${radiantApp}/bin/radiantwave";
   kioskscript = pkgs.writeShellScript "kiosk-start" ''
     # Wait for the Wayland display to be ready
     for i in {1..10}; do
@@ -13,7 +20,7 @@ let
     OUTPUT=$(${pkgs.wlr-randr}/bin/wlr-randr | grep -m1 '^\S' | awk '{print $1}')
     echo "Rotating output: $OUTPUT" >> /tmp/kiosk.log
     ${pkgs.wlr-randr}/bin/wlr-randr --output "$OUTPUT" --transform 90 >> /tmp/kiosk.log 2>&1 || echo "wlr-randr failed" >> /tmp/kiosk.log
-    exec ${radiantApp}/bin/radiantwave -d -s
+    exec ${launchBin} -d -s
   '';
 in
 {