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>

tests/brands-smoke.mjs

@@ -0,0 +1,87 @@
+// Exercise every curated logo with the native desktop renderer. No TV, network
+// service or weather API is used. The contact sheet is a manual design preview.
+import assert from 'node:assert/strict';
+import fs from 'node:fs/promises';
+import path from 'node:path';
+import { spawnSync } from 'node:child_process';
+import sharp from 'sharp';
+
+const root = path.resolve(import.meta.dirname, '..');
+const out = path.join(root, '.build');
+await fs.mkdir(out, { recursive: true });
+function run(command, args) {
+  const result = spawnSync(command, args, { cwd: root, stdio: 'inherit', timeout: 120000 });
+  if (result.error) throw result.error;
+  assert.equal(result.status, 0, `${command} failed`);
+}
+run('cargo', ['build', '--locked', '--package', 'luma', '--no-default-features']);
+const binary = path.resolve(root, process.env.CARGO_TARGET_DIR ?? 'target', 'debug/luma');
+const scratch = await fs.mkdtemp(path.join(out, 'brand-gallery-'));
+try {
+  const preferences = path.join(scratch, 'preferences.json');
+  const dump = path.join(scratch, 'state.json');
+  const diagnostics = path.join(scratch, 'render.json');
+  const screenshot = path.join(scratch, 'card.png');
+  await fs.writeFile(preferences, JSON.stringify({ reduced_motion: true, show_weather: false }));
+  run(binary, [
+    '--preferences',
+    preferences,
+    '--script',
+    'apps',
+    '--frames',
+    '18',
+    '--dump-state',
+    dump,
+  ]);
+  const { inventory } = JSON.parse(await fs.readFile(dump, 'utf8'));
+  const logos = (await fs.readdir(path.join(root, 'assets/logos')))
+    .filter((file) => file.endsWith('.svg'))
+    .map((file) => path.parse(file).name)
+    .sort();
+  const cards = [];
+  for (const [index, logo] of logos.entries()) {
+    const app = inventory.find((app) => app.brand === logo);
+    assert.ok(app, `Desktop demo is missing ${logo}`);
+    run(binary, [
+      '--preferences',
+      preferences,
+      '--script',
+      `apps,type:${app.title},back`,
+      '--frames',
+      '18',
+      '--screenshot',
+      screenshot,
+      '--dump-state',
+      dump,
+      '--diagnostics',
+      diagnostics,
+    ]);
+    const state = JSON.parse(await fs.readFile(dump, 'utf8'));
+    const report = JSON.parse(await fs.readFile(diagnostics, 'utf8'));
+    assert.ok(state.apps.includes(app.id), `${logo} must be searchable in the demo`);
+    assert.equal(report.capture.missing_images, 0, `Missing artwork for ${logo}`);
+    assert.equal(report.capture.glyph_failures, 0, `Invalid caption for ${logo}`);
+    assert.ok(report.capture.vector_meshes > 0);
+    const input = await sharp(screenshot)
+      .extract({ left: 78, top: 264, width: 282, height: 238 })
+      .png()
+      .toBuffer();
+    cards.push({ input, left: (index % 6) * 282, top: Math.floor(index / 6) * 238 });
+  }
+  await sharp({
+    create: {
+      width: 6 * 282,
+      height: Math.ceil(cards.length / 6) * 238,
+      channels: 4,
+      background: '#11151b',
+    },
+  })
+    .composite(cards)
+    .png()
+    .toFile(path.join(out, 'brands-gallery.png'));
+  console.log(
+    `All ${logos.length} SVG-backed demo apps rendered. Contact sheet: .build/brands-gallery.png`,
+  );
+} finally {
+  await fs.rm(scratch, { recursive: true, force: true });
+}