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/compile_wlcs.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+WLCS_SHA=2b385328366de5db19521b9b3eef81861430d984
+
+if [ -f "./wlcs/wlcs" ] && [ "$(cd wlcs; git rev-parse HEAD)" = "${WLCS_SHA}" ] ; then
+    echo "Using cached WLCS."
+else
+    echo "Compiling WLCS."
+    git clone https://github.com/MirServer/wlcs.git
+    cd wlcs || exit
+    # checkout a specific revision
+    git reset --hard "${WLCS_SHA}"
+    cmake -DWLCS_BUILD_ASAN=False -DWLCS_BUILD_TSAN=False -DWLCS_BUILD_UBSAN=False -DCMAKE_EXPORT_COMPILE_COMMANDS=1 .
+    make
+fi