v1.11.5: ContextBar inline next to agent picker; remove ChatContextPopover

ContextBar relocated from a dedicated row above MessageList to inline with
the agent-picker row, filling the space to the right of the picker + plus
button. Always-visible (zero-state when no assistant message has run yet)
via chat.model_context_limit, which GET /api/sessions/:id/chats now
populates from a single getModelContext lookup per session.

ChatContextPopover above the input is removed entirely along with its
useChatContextStats hook (no remaining callers). Color tiers and the
auto-compaction threshold tooltip unchanged.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/src/hooks/useChatContextStats.ts

@@ -1,37 +0,0 @@
-import { useMemo } from 'react';
-import type { Message } from '@/api/types';
-
-export interface ChatContextStats {
-  used: number;
-  max: number;
-  percent: number;
-}
-
-/**
- * Returns the latest context-window usage for the given chat, derived from the
- * assistant message (with both ctx_used and ctx_max populated) having the most
- * recent created_at. Returns null when no such message exists.
- *
- * Re-evaluates whenever the `messages` reference or `chatId` changes, which
- * matches the cadence of streaming updates from `useSessionStream`.
- */
-export function useChatContextStats(
-  chatId: string,
-  messages: Message[],
-): ChatContextStats | null {
-  return useMemo(() => {
-    let latest: Message | null = null;
-    for (const m of messages) {
-      if (m.chat_id !== chatId) continue;
-      if (m.role !== 'assistant') continue;
-      if (m.ctx_used == null || m.ctx_max == null) continue;
-      if (!latest || m.created_at > latest.created_at) latest = m;
-    }
-    if (!latest || latest.ctx_used == null || latest.ctx_max == null) return null;
-    const used = latest.ctx_used;
-    const max = latest.ctx_max;
-    if (max <= 0) return null;
-    const percent = Math.round((used / max) * 100);
-    return { used, max, percent };
-  }, [chatId, messages]);
-}