chat-sidebar header + [showModelPicker] API + narrow welcome overflow fix

[blove]

Summary

Lib (chat)

• `` new input `[showModelPicker]` (default `true`). When `false`, hides the auto-rendered model picker even with non-empty `modelOptions`. Documented in TSDoc — useful in cramped surfaces. `chat-sidebar` and `chat-popup` forward it.
• `` gets a fixed panel header: title slot (``) on the left, the existing close button on the right. Replaces the standalone absolute-positioned close button. Title element shrinks with ellipsis on overflow.

Demo

• Wire `currentThreadTitle` computed signal into the new sidebar title slot.
• Pass `[showModelPicker]="false"` in popup-mode and sidebar-mode (cramped widths).
• Fix welcome-suggestions chip overflow in narrow popup: featured chip now `flex: 1 1 0; min-width: 0` so it shrinks with ellipsis; "More prompts" dropdown gets `flex: 0 0 auto` so it stays its natural size.

Thread title source (FYI)

Python graph's `_slice_title()` normalizes the first user message and saves it to `thread.metadata.title` on the first run. See `examples/chat/python/src/graph.py:55-81`. The demo's threads service surfaces it via `threads()`; the new `currentThreadTitle` signal reads the active thread.

@ngaf/* 0.0.42.

Test plan

• `pnpm nx test chat` — green
• `pnpm nx test examples-chat-angular` — 21 tests pass
• Local chrome-mcp: sidebar panel header renders with title "say hi briefly" + close button (position: static, inside the flex header row); model picker hidden in both sidebar and popup panels; welcome chip in popup width 174 + dropdown 134, no overlap
• Canonical demo redeploys on demo.threadplane.ai

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
threadplane	Ready	Preview, Comment	May 19, 2026 4:43pm