feat: sessions page workspace-first flow + workspace instance chips

- Sessions page: replaced CreateSessionForm with workspace selector + ToolStarter
  - Fetches workspaces, shows dropdown, then renders ToolStarter for selected workspace
  - Removed old project/repo/tool-type/config-profile/clone-mode flow
- Workspace cards: new WorkspaceInstanceChips component fetches and displays
  running instances per workspace with status-colored chips and open links
- Styles: .instance-chip variants (running/starting/error), .tool-starter-header

Quality gates: tsc --noEmit clean, pytest workspaces API (9 passed, 1 skipped)

apps/web/src/components/tool-starter.tsx

@@ -14,7 +14,11 @@ export interface ToolStarterProps {
 	onCancel?: () => void;
 }
 
-export function ToolStarter({ workspace, onStarted, onCancel }: ToolStarterProps) {
+export function ToolStarter({
+	workspace,
+	onStarted,
+	onCancel,
+}: ToolStarterProps) {
 	const [toolTypes, setToolTypes] = useState<ToolType[]>([]);
 	const [toolTypesLoading, setToolTypesLoading] = useState(true);
 	const [toolTypesError, setToolTypesError] = useState<string | null>(null);
@@ -105,9 +109,7 @@ export function ToolStarter({ workspace, onStarted, onCancel }: ToolStarterProps
 		setStarting(true);
 		setError(null);
 		try {
-			const { createInstance, startInstance } = await import(
-				"../api/sessions"
-			);
+			const { createInstance, startInstance } = await import("../api/sessions");
 			const instance = await createInstance(
 				workspace.project_id,
 				workspace.repo_id,
@@ -132,12 +134,7 @@ export function ToolStarter({ workspace, onStarted, onCancel }: ToolStarterProps
 		} finally {
 			setStarting(false);
 		}
-	}, [
-		selectedToolTypeId,
-		selectedProfileId,
-		workspace,
-		onStarted,
-	]);
+	}, [selectedToolTypeId, selectedProfileId, workspace, onStarted]);
 
 	return (
 		<div className="tool-starter">
@@ -180,12 +177,8 @@ export function ToolStarter({ workspace, onStarted, onCancel }: ToolStarterProps
 						</option>
 					))}
 				</select>
-				{toolTypesLoading && (
-					<span className="muted">Loading tools...</span>
-				)}
-				{toolTypesError && (
-					<span className="error-text">{toolTypesError}</span>
-				)}
+				{toolTypesLoading && <span className="muted">Loading tools...</span>}
+				{toolTypesError && <span className="error-text">{toolTypesError}</span>}
 			</div>
 
 			{/* Config Profile */}
@@ -227,8 +220,7 @@ export function ToolStarter({ workspace, onStarted, onCancel }: ToolStarterProps
 					</span>
 				) : (
 					<span className="warning-text">
-						<Icon name="warning" size="sm" />{" "}
-						No SSH key assigned to repository
+						<Icon name="warning" size="sm" /> No SSH key assigned to repository
 					</span>
 				)}
 			</div>