feat: BooCode 2.0 UI — Ember theme, brand banner, coder tabs, model-attribution chips

- Ember theme (Obsidian charcoal + #ff7a18 orange), now DEFAULT_THEME_ID; server theme_id whitelist gains 'ember'
- Brand banner: transparent Westie mascot + >_BooCode wordmark, big/edge-to-edge (flood-filled to transparency + cropped)
- Coder panes are multi-tab: + opens a BooCode tab, split opens a pane (shared ChatTabBar via tabKind + createCoderTab; closeOtherTabs/tab-numbering extended to coder)
- Model-attribution: new messages.model column stamped at finalizeCompletion (BooChat/native coder) + dispatcher assistant-row creation (external coder); surfaced via view + wire types + live frame; rendered as a subtle shortened-name chip (shortenModelName)
- Composer Web toggle moved into a boxed focus-ringed input; glowing accent dot on tool rows
- Claude SDK follow-ups (1M context, follow-up-message fix, collapsed thinking/tool chips) + CLAUDE_SDK_BACKEND=1

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/server/src/routes/chats.ts

@@ -441,7 +441,7 @@ export function registerChatRoutes(
       const rows = await sql<Message[]>`
         SELECT id, session_id, chat_id, role, content, kind, tool_calls, tool_results, status, last_seq,
                tokens_used, ctx_used, ctx_max, started_at, finished_at, created_at, metadata,
-               summary, tail_start_id, compacted_at
+               summary, tail_start_id, compacted_at, model
         FROM messages_with_parts
         WHERE chat_id = ${req.params.id}
         ORDER BY created_at ASC, id ASC

apps/server/src/routes/messages.ts

@@ -118,7 +118,7 @@ export function registerMessageRoutes(
       const rows = await sql<Message[]>`
         SELECT id, session_id, chat_id, role, content, kind, tool_calls, tool_results, status, last_seq,
                tokens_used, ctx_used, ctx_max, started_at, finished_at, created_at, metadata,
-               summary, tail_start_id, compacted_at
+               summary, tail_start_id, compacted_at, model
         FROM messages_with_parts
         WHERE session_id = ${req.params.id}
         ORDER BY created_at ASC, id ASC

apps/server/src/routes/settings.ts

@@ -22,8 +22,9 @@ export async function setSetting(
   `;
 }
 
-// themes-v1: whitelist of the 18 preset theme ids. Kept in sync with
+// themes-v1: whitelist of the preset theme ids. Kept in sync with
 // docs/themes_v1.md §1 and apps/web/src/lib/theme.ts THEMES.
+// (+ 'ember' — the BooCode 2.0 signature, now the default.)
 const THEME_IDS = [
   'obsidian',
   'gunmetal',
@@ -43,6 +44,7 @@ const THEME_IDS = [
   'chalk',
   'cobalt',
   'midnight-sapphire',
+  'ember',
 ] as const;
 
 const THEME_MODES = ['dark', 'light', 'system'] as const;

apps/server/src/routes/ws.ts

@@ -27,7 +27,7 @@ export function registerWebSocket(
       const messages = await sql<Message[]>`
         SELECT id, session_id, chat_id, role, content, kind, tool_calls, tool_results, status, last_seq,
                tokens_used, ctx_used, ctx_max, started_at, finished_at, created_at, metadata,
-               summary, tail_start_id, compacted_at
+               summary, tail_start_id, compacted_at, model
         FROM messages_with_parts
         WHERE session_id = ${sessionId}
         ORDER BY created_at ASC, id ASC

apps/server/src/schema.sql

@@ -107,6 +107,11 @@ END $$;
 -- a single jsonb object {tool_call_id, output, truncated, error?}.
 -- reasoning_parts is consumed by the inference history fetch (payload.ts)
 -- for v1.13.1-C reasoning round-tripping. Not surfaced in external APIs.
+-- model-attribution: which model produced an assistant message (NULL for
+-- user/system rows and pre-existing messages). Stamped at finalize (BooChat /
+-- native coder) and at assistant-row creation (external coder dispatcher).
+ALTER TABLE messages ADD COLUMN IF NOT EXISTS model TEXT;
+
 CREATE OR REPLACE VIEW messages_with_parts AS
 SELECT
   m.id, m.session_id, m.chat_id, m.role, m.content, m.kind, m.status,
@@ -122,7 +127,10 @@ SELECT
     ORDER BY p.sequence LIMIT 1) AS tool_results,
   (SELECT jsonb_agg(p.payload ORDER BY p.sequence)
      FROM message_parts p
-    WHERE p.message_id = m.id AND p.kind = 'reasoning' AND p.hidden_at IS NULL) AS reasoning_parts
+    WHERE p.message_id = m.id AND p.kind = 'reasoning' AND p.hidden_at IS NULL) AS reasoning_parts,
+  -- NEW columns MUST be appended at the end: CREATE OR REPLACE VIEW can't
+  -- reorder/rename existing columns (42P16). m.model added last.
+  m.model
 FROM messages m;
 
 -- v1.13.20: drop legacy tool_calls/tool_results columns. Reads have routed

apps/server/src/services/inference/error-handler.ts

@@ -119,6 +119,7 @@ export async function finalizeCompletion(
         tokens_used = ${completionTokens},
         ctx_used = ${promptTokens},
         ctx_max = ${nCtx},
+        model = ${session.model},
         finished_at = clock_timestamp()
     WHERE id = ${assistantMessageId}
     RETURNING tokens_used, ctx_used, ctx_max, finished_at