refactor: extract dashboard, workspace, tool-types, and tool-configs components (Task 4.3)

- Extract DashboardSummary, ActiveSessionsList, ProjectsSection, QuickCreateForm,
  RecentSessionsSection from dashboard.tsx (480 → 110 lines)
- Extract WorkspaceSidebar from repo-workspace.tsx
- Extract ToolTypeList + ToolTypeForm from tool-types.tsx (409 → 135 lines)
- Extract ToolConfigList + ToolConfigForm from tool-configs.tsx (391 → 178 lines)
- Add use-dashboard-actions hook for shared dashboard action handlers
- Update feature barrels with new exports

Quality gates: tsc (pass), eslint (pass)
Refs: repo-restructure Task 4.3

apps/web/src/components/features/git/WorkspaceSidebar.tsx

@@ -0,0 +1,67 @@
+import type { GitRepository } from "../../../types/git-repository";
+import type { GitStatus } from "../../../api/git_repositories";
+import type { ToolType } from "../../../types/tool-type";
+import { FileBrowser } from "./FileBrowser";
+import { CommitPanel } from "../../../components/commit-panel";
+import { InstanceList } from "../../../components/instance-list";
+
+interface WorkspaceSidebarProps {
+	projectId: string;
+	repoId: string;
+	repositories: GitRepository[];
+	gitStatus: GitStatus | null;
+	toolTypes: ToolType[];
+	onRepoChange: (repoId: string) => void;
+	onCommit: () => void;
+}
+
+export const WorkspaceSidebar = ({
+	projectId,
+	repoId,
+	repositories,
+	gitStatus,
+	toolTypes,
+	onRepoChange,
+	onCommit,
+}: WorkspaceSidebarProps) => {
+	return (
+		<aside className="workspace-sidebar">
+			<div className="sidebar-section">
+				<label className="form-field">
+					Repository
+					<select
+						value={repoId}
+						onChange={(e) => onRepoChange(e.target.value)}
+					>
+						{repositories.map((repo) => (
+							<option key={repo.id} value={repo.id}>
+								{repo.name}
+							</option>
+						))}
+					</select>
+				</label>
+			</div>
+			<FileBrowser
+				projectId={projectId}
+				repoId={repoId}
+				gitStatus={gitStatus}
+			/>
+			{gitStatus && (
+				<CommitPanel
+					projectId={projectId}
+					repoId={repoId}
+					modified={gitStatus.modified}
+					added={gitStatus.added}
+					deleted={gitStatus.deleted}
+					untracked={gitStatus.untracked}
+					onCommit={onCommit}
+				/>
+			)}
+			<InstanceList
+				projectId={projectId}
+				repoId={repoId}
+				toolTypes={toolTypes}
+			/>
+		</aside>
+	);
+};