Integrate native Rime and stabilize input, output, and rendering

- Add optional modifier-only Super binding whose tap is cancelled by
  other input, focus changes, grabs, locks, and session teardown.
- Ship the native ferese-rime user service, Rime defaults, installer
  inventory, package dependencies, session environment, and docs.
- Vendor Smithay 8a27023 with the SHM texture-cache format fix and add
  GPU regressions for format changes and resize snapshots.
- Release reused CRTC owners before staging output modes, then restore
  changed outputs before former owners when a transaction fails.
- Wait for resize-capture GPU completion, expand filtered surface
  damage, and preserve IME popup origin under fractional scaling.
- Mark weekends like holidays in both calendar layouts.

docs/shortcuts.md

@@ -24,6 +24,13 @@ current workspace. Power off, restart and logout also require **Alt + Enter**.
 
 Run `feresectl launcher toggle` to open or close it from a script.
 
+To also toggle the launcher by pressing and releasing Super alone, add
+`binding "Super" action="toggle-launcher"` to your configuration. The action runs
+on release; using another key, the pointer or a held mouse button cancels it, so
+Super+Space and Super+mouse combinations continue to work. See
+[modifier-only bindings](configuration/bindings.md) for input ownership and
+cancellation behavior.
+
 ## Move and resize with the mouse
 
 | Action | Result |