feat(whats-new): remote release notes with dev workspace mode (#1058)

* feat(whats-new): remote release notes with dev workspace mode

Add WHATS_NEW.md, CI whats-new.md asset upload, and client fetch/cache
with embedded fallbacks. Dev and -dev builds read the full file from the
repo for debugging; RC/stable download the release asset on first use.

* fix(whats-new): render ## headings and add changelog tab

Parse h2 sections in release-notes markdown; load changelog alongside
highlights and let users switch views on the What's New page.

* fix(whats-new): prefetch on startup and fix CI typecheck prebuild

Prefetch whats-new asset when the shell loads on RC/stable builds.
Run prebuild:release-notes before tsc and coverage jobs so the
gitignored generated bundle exists in CI.

* docs: CHANGELOG and credits for What's New remote notes (PR #1058)

* fix(whats-new): always slice embedded release notes to current line

Drop full CHANGELOG embed for -dev bundles; tauri:dev still reads live
markdown from the repo. Ignore all of src/generated/ in git.

* fix(whats-new): fetch release asset via Rust to bypass CORS

Route whats-new.md download through fetch_url_bytes; rename the
technical tab label; add fetch unit tests (PR #1058 review).

package.json

@@ -4,15 +4,16 @@
   "private": true,
   "scripts": {
     "check:css-imports": "node scripts/check-css-import-graph.mjs",
+    "prebuild:release-notes": "node scripts/generate-release-notes-bundle.mjs",
     "dev": "vite",
-    "build": "tsc && vite build",
+    "build": "npm run prebuild:release-notes && tsc && vite build",
     "preview": "vite preview",
     "tauri": "tauri",
     "tauri:dev": "tauri dev",
-    "tauri:build": "tauri build",
-    "test": "vitest run && npm run check:css-imports",
+    "tauri:build": "npm run prebuild:release-notes && tauri build",
+    "test": "npm run prebuild:release-notes && vitest run && node --test scripts/extract-release-section.test.mjs && npm run check:css-imports",
     "test:watch": "vitest",
-    "test:coverage": "vitest run --coverage && npm run check:css-imports"
+    "test:coverage": "npm run prebuild:release-notes && vitest run --coverage && npm run check:css-imports"
   },
   "dependencies": {
     "@fontsource-variable/dm-sans": "^5.2.8",