refactor(shared-tailwind): rewrite themes.css to single-layer shadcn convention

Pre-launch theme system audit found multiple parallel layers in themes.css
(--theme-X full hsl strings, --X partial shadcn aliases, --color-X populated
by runtime store with raw channels) plus dead-code companion files. The
inconsistency caused light-mode regressions when scoped-CSS consumers
wrote `var(--color-X)` standalone — the variable holds raw HSL channels
which is invalid as a color value, browser fell back to inherited (white).

Rewrite to one consistent layer:

  - Source of truth: --color-X defined as raw HSL channels (e.g.
    `0 0% 17%`) in :root, .dark, and all variant [data-theme="..."]
    blocks. Matches the format the runtime store
    (@mana/shared-theme/src/utils.ts) writes, eliminating the
    static-fallback-vs-runtime mismatch and the corresponding flash
    of unstyled content on hydration.

  - @theme inline uses self-reference + Tailwind v4 <alpha-value>
    placeholder so utility classes generate correctly AND opacity
    modifiers work: `text-foreground/50` → `hsl(var(--color-foreground) / 0.5)`.

  - @layer components (.btn-primary, .card, .badge, etc.) wraps
    var(--color-X) refs with hsl() — they were broken in light mode
    too for the same reason.

Convention going forward (also documented in the file header):

  1. Markup: use Tailwind utility classes (text-foreground, bg-card, …)
  2. Scoped CSS: hsl(var(--color-X)) — always wrap with hsl()
  3. NEVER raw var(--color-X) in CSS — that's the bug pattern

Net file: 692 → 580 LOC. Single source layer, no indirection.

Also delete dead companion files (zero imports anywhere):
  - tailwind-v4.css (had broken self-reference, never imported)
  - theme-variables.css (legacy hex-based palette)
  - components.css (legacy component utilities)
  - index.js / preset.js / colors.js (Tailwind v3 preset format,
    irrelevant under Tailwind v4)

package.json exports map shrinks accordingly to just `./themes.css`.

Consumers using `hsl(var(--color-X))` (~379 files across mana-web,
manavoxel-web, arcade-web) keep working unchanged — the public API
name `--color-X` is preserved. Only the broken pattern `var(--color-X)`
(~61 files) needs a follow-up sweep, handled in a separate commit.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/news/CLAUDE.md

@@ -1,67 +1,17 @@
-# News Hub — AI News Reader & Personal Library
+# News Hub — consolidated into the unified Mana app
 
-## Architecture
+This product was migrated into the unified Mana monorepo. The legacy
+per-product `apps/news/apps/server/` and `apps/news/apps/web/` directories
+have been removed. Active code now lives in:
 
-Local-first for saved articles, Hono/Bun server for content extraction and AI feed.
+- **Backend compute routes**: [`apps/api/src/modules/news/routes.ts`](../api/src/modules/news/routes.ts) (Mozilla Readability extraction, AI feed)
+- **Frontend module** (local-first): [`apps/mana/apps/web/src/lib/modules/news/`](../mana/apps/web/src/lib/modules/news/)
+- **Web route**: [`apps/mana/apps/web/src/routes/(app)/news/`](../mana/apps/web/src/routes/(app)/news/)
+- **Landing page** (still standalone): [`apps/news/apps/landing/`](apps/landing/)
 
-```
-Browser → IndexedDB (Saved Articles, Categories)
-              ↕ sync
-         mana-sync → PostgreSQL
+For monorepo-wide patterns (auth, sync, encryption, services), see the
+[root `CLAUDE.md`](../../CLAUDE.md) and [`apps/mana/CLAUDE.md`](../mana/CLAUDE.md).
 
-Browser → Hono Server → Content Extraction (Mozilla Readability)
-                      → AI Feed (from sync_changes)
-```
-
-## Project Structure
-
-```
-apps/news/
-├── apps/
-│   ├── web/        # SvelteKit web app (local-first)
-│   ├── server/     # Hono/Bun (extraction, feed API)
-│   └── landing/    # Astro marketing page
-└── package.json
-```
-
-## Tech Stack
-
-| Layer | Technology |
-|-------|-----------|
-| **Web** | SvelteKit 2, Svelte 5 (runes), Tailwind CSS 4 |
-| **Server** | Hono + Bun, Mozilla Readability, JSDOM |
-| **Data** | Local-first (Dexie.js + mana-sync) |
-| **Auth** | mana-auth (Better Auth + EdDSA JWT) |
-
-## Commands
-
-```bash
-pnpm dev:news:web       # SvelteKit dev server
-pnpm dev:news:server    # Hono/Bun server (port 3071)
-pnpm dev:news:local     # Web + Sync + Server (no auth)
-pnpm dev:news:full      # Everything incl. auth
-```
-
-## Hono Server Routes
-
-| Route | Auth | Description |
-|-------|------|-------------|
-| `GET /health` | No | Health check |
-| `GET /api/v1/feed` | No | AI article feed (type, categoryId, limit, offset) |
-| `GET /api/v1/feed/:id` | No | Single article |
-| `POST /api/v1/extract/preview` | No | Preview URL content extraction |
-| `POST /api/v1/extract/save` | JWT | Extract + return article data |
-
-## Local-First Collections
-
-| Collection | Purpose |
-|-----------|---------|
-| `articles` | Saved articles (user_saved) + AI feed cache |
-| `categories` | Article categories |
-
-## Key Patterns
-
-- **Content Extraction**: Mozilla Readability + JSDOM for robust HTML parsing
-- **Saved Articles**: Local-first via IndexedDB, sync to server
-- **AI Feed**: Loaded from Hono server, not local-first (server-generated)
-- **Auth**: Guest mode allowed, sync starts on login
+The previous standalone "News Hub" guide was deleted in the audit cleanup
+of 2026-04-09 — it had been inaccurate since the consolidation.
+Pre-consolidation reference is in git history.

apps/news/package.json

@@ -1,8 +1,5 @@
 {
 	"name": "@mana/news",
 	"version": "0.0.1",
-	"private": true,
-	"scripts": {
-		"dev": "turbo run dev"
-	}
+	"private": true
 }