feat: vscode extension (#59)

* feat: add initial VS Code extension plan and implementation tasks

* feat(vscode): added initial version of an Openchamber VSCode extension

* feat(vscode): enhance VS Code extension with theme integration and session management

* feat(vscode): implement connection status handling and overlay in VSCode layout

* feat: move extension to secondary sidebar

* chore: upgrade @opencode-ai/sdk to 1.0.150

* vscode: editor bridge, file picker, click-to-open in tool parts

* vscode: layout session lifecycle, theme sync, typography overrides

* ui: compact mode for vscode, model search, autocomplete width fixes

* perf: scroll force flag, raf placeholder, git polling backoff

* ui: tool output styling, markdown code block fix, gitignore

* refactor: update typography handling for VSCode runtime, remove unused styles

* docs: update README with VS Code extension details and add extension image

* docs: update changelog with new features and performance improvements

packages/vscode/webview/api/tools.ts

@@ -0,0 +1,22 @@
+import type { ToolsAPI } from '@openchamber/ui/lib/api/types';
+
+// Use same endpoint as web - fetch interceptor handles URL rewriting
+export const createVSCodeToolsAPI = (): ToolsAPI => ({
+  async getAvailableTools(): Promise<string[]> {
+    const response = await fetch('/api/experimental/tool/ids');
+
+    if (!response.ok) {
+      throw new Error(`Tools API returned ${response.status} ${response.statusText}`);
+    }
+
+    const data = await response.json();
+
+    if (!Array.isArray(data)) {
+      throw new Error('Tools API returned invalid data format');
+    }
+
+    return data
+      .filter((tool: unknown): tool is string => typeof tool === 'string' && tool !== 'invalid')
+      .sort();
+  },
+});