Inhibit idle lock for fullscreen windows on ringtail (#212)

## Summary
- Adds `inhibit_idle fullscreen` window commands to sway config on ringtail
- Covers both Wayland-native (`app_id`) and XWayland (`class`) windows
- Prevents swayidle from locking the screen during gamepad-only gaming sessions where controller input isn't detected by the Wayland idle tracker

## Notes
This is a blanket fullscreen inhibit. A more targeted approach (daemon monitoring `/dev/input` gamepad events) may be desired later to allow idle lock during long-running fullscreen apps like Factorio.

## Deployment and Testing
- [ ] `mise run provision-ringtail` to deploy
- [ ] Run a fullscreen app and verify swayidle doesn't lock after 15 minutes
- [ ] Verify lock still activates when no fullscreen window is present

Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/212

docs/changelog.d/sway-inhibit-idle-fullscreen.bugfix.md

@@ -0,0 +1 @@
+Inhibit swayidle lock screen when a fullscreen window is active on ringtail, preventing screen lock during gamepad-only gaming sessions.

nixos/ringtail/configuration.nix

@@ -213,6 +213,10 @@ in
         window = {
           border = 2;
           titlebar = false;
+          commands = [
+            { command = "inhibit_idle fullscreen"; criteria = { class = ".*"; }; }
+            { command = "inhibit_idle fullscreen"; criteria = { app_id = ".*"; }; }
+          ];
         };
         colors = {
           focused = {