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>

package.json

@@ -0,0 +1,50 @@
+{
+  "name": "lg-luma",
+  "version": "2.3.1",
+  "private": true,
+  "description": "A modern, remote-first webOS launcher.",
+  "license": "MIT",
+  "type": "module",
+  "packageManager": "pnpm@10.34.5",
+  "engines": {
+    "node": ">=22",
+    "pnpm": ">=10 <11"
+  },
+  "scripts": {
+    "dev": "cargo run --locked --",
+    "build": "sh tools/build-webos.sh",
+    "package": "pnpm assets && pnpm build && node tools/package.mjs && node tools/repository.mjs",
+    "deploy": "pnpm run package && node tools/deploy.mjs",
+    "test": "pnpm test:release && pnpm test:home && pnpm test:icons && cargo test --locked --workspace --all-features",
+    "test:release": "node --test tests/release.test.mjs",
+    "test:home": "node --test tests/home-splash.test.mjs tests/sync-splash.test.mjs",
+    "test:icons": "node --test tests/read-app-icon.test.mjs tests/brand-assets.test.mjs",
+    "test:smoke": "node tests/smoke.mjs && node tests/brands-smoke.mjs && node tests/weather-smoke.mjs && node tests/translations-smoke.mjs",
+    "test:brands": "node tests/brands-smoke.mjs",
+    "check": "pnpm version:check && pnpm lint && cargo clippy --locked --workspace --all-targets --all-features -- -D warnings",
+    "lint": "oxlint --deny-warnings .",
+    "lint:fix": "oxlint --fix --deny-warnings .",
+    "format": "cargo fmt --all && oxfmt --write .",
+    "format:check": "cargo fmt --all -- --check && oxfmt --check .",
+    "assets": "node tools/assets.mjs",
+    "screenshots": "pnpm assets && node tools/screenshots.mjs",
+    "assets:vector": "node tools/vector-assets.mjs",
+    "assets:brands": "node tools/brand-assets.mjs",
+    "assets:fonts": "node tools/font-assets.mjs",
+    "runtime": "node tools/webos-runtime.mjs",
+    "sdk": "node tools/setup-webos-sdk.mjs",
+    "test:weather": "node tests/weather-smoke.mjs",
+    "test:translations": "node tests/translations-smoke.mjs",
+    "changeset": "changeset",
+    "version:release": "changeset version && pnpm version:sync && oxfmt --write CHANGELOG.md",
+    "version:sync": "node tools/sync-version.mjs",
+    "version:check": "node tools/sync-version.mjs --check"
+  },
+  "devDependencies": {
+    "@changesets/cli": "3.0.3",
+    "@webos-tools/cli": "3.2.6",
+    "oxfmt": "0.73.0",
+    "oxlint": "1.88.0",
+    "sharp": "0.35.5"
+  }
+}