Changeset 0.37.8 (#220)

Co-authored-by: gobha <jasafpro@gmail.com>
Co-committed-by: gobha <jasafpro@gmail.com>

CHANGELOG.md

@@ -1,5 +1,58 @@
 # Changelog
 
+## [0.37.8] — 2026-03-21
+
+### Summary
+
+Preact ChatPane kit — composable chat components replacing the old
+imperative `chat-pane.js` standalone mode. Every piece (hooks,
+components, utilities) independently importable. `ChatPane` is the
+default assembly; surfaces import individual pieces for custom layouts.
+
+### New
+
+- **ChatPane kit** (`src/js/sw/components/chat-pane/`) — 9 files:
+  - `ChatPane` — default assembly: header + messages + input
+  - `useChat(opts)` — channel state machine (messages, send/receive,
+    model selection, channel CRUD)
+  - `useStream()` — SSE ReadableStream parser with rAF-batched updates
+  - `MessageList` — scrollable messages with auto-scroll-to-bottom
+  - `MessageBubble` — single message with role styling + markdown
+  - `MessageInput` — auto-resize textarea, Enter-to-send, handleRef
+  - `ModelSelector` — model dropdown from `sw.api.models.enabled()`
+  - `ChatHistory` — channel history select + new-chat button
+  - `renderMarkdown` — `marked` + `DOMPurify` wrapper with fallback
+- **`sw.chatPane(container, opts)`** — SDK mount helper, lazy-imports
+  Preact ChatPane, returns imperative handle
+- **`sw-chat-pane.css`** — component styles with `sw-` prefix convention
+- **Layer 1.5: Components** — `src/js/sw/components/` directory
+  established for reusable compound components (between SDK and surfaces)
+
+### Changed
+
+- `switchboard-sdk.js` — `sw.chat()` now prefers `window.sw.chatPane()`
+  when new SDK is loaded, falls back to legacy `ChatPane.mount()`
+- `chat-pane.js` — stripped standalone mode (446 → 160 lines). Removed
+  `mount()`, `_initStandalone()`, and all streaming/model/history logic.
+  Retained DOM-binding `create()` for legacy chat surface (`app.js`)
+- `server/version.go` — version `0.37.6` → `0.37.8`
+- `VERSION` — `0.37.6` → `0.37.8`
+- `src/js/sw/sdk/index.js` — `sw.chatPane()` helper, `sw._sdk` → `0.37.8`
+- `server/pages/templates/base.html` — added `sw-chat-pane.css` link
+
+### Design Notes
+
+- **Kit of Parts + Default Assembly** — every hook and component is
+  independently importable. Future Chat surface (v0.37.10) will import
+  `useChat`, `useStream`, `MessageList`, `MessageInput` individually
+  with a completely different layout.
+- **handleRef pattern** — core Preact only exposes `{ h, render }`;
+  `forwardRef` requires `preact/compat`. Components use a `handleRef`
+  prop pattern instead: caller passes `{ current: null }`, component
+  populates with imperative methods via `useEffect`.
+
+---
+
 ## [0.37.7] — 2026-03-21
 
 ### Summary