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.

vendor/smithay/smithay-drm-extras/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "smithay-drm-extras"
+version = "0.1.0"
+edition = "2024"
+license = "MIT"
+authors = ["Bartłomiej Maryńczak <[email protected]>"]
+
+[dependencies]
+libdisplay-info = { version = "0.3.0", optional = true }
+drm = { version = "0.14.0" }
+
+[features]
+default = ["display-info"]
+display-info = ["libdisplay-info"]
+
+[dev-dependencies.smithay]
+path = "../"