Design overhaul, stats page, internal notes

Design: Onest+Unbounded font pairing (Cyrillic-verified, replacing plain
Golos Text), manual light/dark toggle wired to the data-theme cascade
already built in MVP-1, refreshed palette + new chart-mark tokens
(CVD-validated via the dataviz skill's validator), colored avatar
initials, per-channel colored badges, favicon, nicer empty states.

Stats: /stats page — status/channel breakdown, 14-day ticket volume,
avg first-response time, per-agent open-ticket workload. Colors and
chart forms follow the dataviz skill's procedure (categorical order
re-stepped to clear the CVD adjacency check in both themes).

Internal notes: messages.visibility ("public"/"internal") column.
Agent-only notes never reach customer-facing reads (getTicketForCustomer)
or the customer SSE stream (/api/portal/events, reused by the widget) —
fixed at both the initial-fetch and live-delivery layers.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QcXH24ky6zjk2UyK5oZUPH

src/lib/db/migrations/meta/_journal.json

@@ -22,6 +22,13 @@
       "when": 1785072485453,
       "tag": "0002_broad_stellaris",
       "breakpoints": true
+    },
+    {
+      "idx": 3,
+      "version": "6",
+      "when": 1785076018169,
+      "tag": "0003_absurd_zemo",
+      "breakpoints": true
     }
   ]
 }