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/brand-assets.test.mjs

@@ -0,0 +1,39 @@
+import assert from 'node:assert/strict';
+import fs from 'node:fs/promises';
+import test from 'node:test';
+import sharp from 'sharp';
+import { sources, prepareSvg } from '../tools/brand-assets.mjs';
+
+test('every expanded brand has standalone, renderable vector artwork and pinned provenance', async () => {
+  assert.equal(sources.length, 27);
+  for (const [name, url, hash] of sources) {
+    assert.match(hash, /^[0-9a-f]{64}$/, name);
+    const svg = await fs.readFile(new URL(`../assets/logos/${name}.svg`, import.meta.url), 'utf8');
+    assert.ok(svg.includes(url), `Missing source attribution for ${name}`);
+    assert.doesNotMatch(svg, /<image\b|<text\b|=\{/, name);
+    const { data, info } = await sharp(Buffer.from(svg))
+      .resize(256, 128, { fit: 'inside' })
+      .ensureAlpha()
+      .raw()
+      .toBuffer({ resolveWithObject: true });
+    assert.ok(
+      data.some((value, index) => index % info.channels === 3 && value > 0),
+      `Empty logo: ${name}`,
+    );
+  }
+});
+
+test('source preparation preserves paths and removes component syntax and redundant clipping', () => {
+  const svg = prepareSvg(
+    'coupang-play',
+    'export default () => (<svg width={115} height={22} style={{ width: 115 }}><g clip-path="url(#bounds)"><path d="M0 0L1 1L1 0Z"/></g><defs><clipPath id="bounds"/></defs></svg>);',
+    'https://example.com/source',
+  );
+  assert.match(svg, /width="115"/);
+  assert.match(svg, /d="M0 0L1 1L1 0Z"/);
+  assert.doesNotMatch(svg, /export|style=|clip-path|<defs>|=\{/);
+  assert.doesNotMatch(
+    prepareSvg('hulu', '<?xml version="1.0"?><svg/>', 'https://example.com/source'),
+    /<\?xml/,
+  );
+});