v0.1.0-beta.3

Named themes + project layout refactor

Theme system migrates to Tailwind v4 @theme tokens with two named themes (Midnight / Bright Surfaces), the desktop titlebar finally follows the app theme, and the repository layout is reorganized (frontend/ + server/ + flattened src-tauri/).

🚀 Features

• Named themes (Zed-style) — Settings → Appearance: pick Midnight (dark, default) or Bright Surfaces (light). Palettes live in @theme tokens (bg-background, text-foreground, …); light mode corrects the hardcoded zinc text that was invisible on white
• Titlebar follows the app theme — Tauri window theme: Dark config + window.setTheme() runtime; fixed the ACL gap (core:window:allow-set-theme) that silently blocked theme switching; meta theme-color drives the web browser chrome
• Show/hide password — new PasswordInput on the web login and change-password forms (eye toggle, type="button", aria-labeled)
• E2E Playwright suites — theme-check (12 assertions: dark/light/picker/persist) + web-smoke (4 assertions: health, setup wizard, logout, login against the real server)

🔄 Refactor

• Layout — src/ → frontend/, src-tauri-server/ → server/ (flattened, [[bin]] path = main.rs), src-tauri/src/ flattened to crate root; all configs, CI, Dockerfile, docs updated; server reuses desktop modules via #[path]
• Markdown module deduped — markdown.rs shared by desktop + server via #[path] include (was copy-pasted twice); snapshot tests lock the HTML contract for both
• Testing hardening — 9 API integration tests (axum tower::oneshot: setup token gate, rate limits, session, path allowlist), store tests now exercise the real useAiSettings (was a copy), regression tests for setup-token + git-poll skip, tsc/clippy CI blockers fixed
• Zinc → tokens — hardcoded zinc text/hover colors migrated to theme tokens (light-theme visibility)

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