Merge Luma launcher fork into monorepo

Move trampoline files (boot-hook, watcher, overlay) into trampoline/
subdirectory. Add upstream Luma v2.3.1 source at repo root with our
additions:

- Page::Ha (4th nav tab) with placeholder empty state
- HA tab config schema and default entity mapping (ha-home/)
- Nav keys renamed: "home" → "start", new "ha" tab between Apps and Settings
- All state.rs/view.rs/main.rs/tests.rs updated for 4-tab navigation

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pnpm-workspace.yaml

@@ -0,0 +1,9 @@
+onlyBuiltDependencies:
+  - sharp
+
+# webOS CLI's postinstall only changes bundled config permissions. SSH's optional
+# native accelerators aren't required; its portable JavaScript transport is used.
+ignoredBuiltDependencies:
+  - '@webos-tools/cli'
+  - cpu-features
+  - ssh2