mail list redesign, folder actions, empty-folder, unread badges & empty-state art

Frontend:
- Redesign the mail list rows (avatar + sender + subject/snippet + right rail),
  even-spaced attachment/pin/archive/trash icons, hover-reveal actions, pink
  always-on pin, monocolor paperclip, row gaps, wider sender-subject gap.
- Sidebar folder badges: Inbox unread + Drafts counts (live via WS + mutations).
- Trash/Spam/Archive: hover Restore icon (replaces Archive), permanent delete in
  Trash; "Empty trash" / "Empty spam" buttons on the sort bar.
- Reading pane empty state: email illustration above an enlarged
  "Select a conversation".
- Search field clear (X) button; mark-read after a 4s dwell instead of instantly.

Backend:
- GET /api/mailboxes/counts (inbox unread + drafts) for the sidebar badges.
- POST /api/folders/{special}/empty + empty_folder_job to permanently clear a
  Trash/Spam/Archive folder (server EXPUNGE + DB rows + thread cleanup).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01U72FZiF1W1pb8XxyWBTREA

backend/tests/mail/test_actions.py

@@ -245,6 +245,18 @@ async def test_delete_thread_enqueues_permanent_delete(ctx: Ctx) -> None:
     assert ctx.enqueued == [("delete_thread_job", str(ctx.thread_id))]
 
 
+async def test_empty_folder_enqueues_job(ctx: Ctx) -> None:
+    resp = await ctx.client.post("/api/folders/trash/empty", headers=_hdr())
+    assert resp.status_code == 200
+    assert ctx.enqueued == [("empty_folder_job", str(ctx.user_id), "trash")]
+
+
+async def test_empty_folder_rejects_non_removable_folder(ctx: Ctx) -> None:
+    resp = await ctx.client.post("/api/folders/inbox/empty", headers=_hdr())
+    assert resp.status_code == 400
+    assert ctx.enqueued == []
+
+
 async def test_ignores_unknown_flags(ctx: Ctx) -> None:
     mid = ctx.message_ids[0]
     resp = await ctx.client.post(