fix: allow workspace creation from workspaces page

- Replace awkward first-workspace-guessing logic with inline project/repo selector
- New WorkspaceCreateInline component with cascading dropdowns:
  - Select project → loads repositories for that project
  - Select repository → enter workspace name + branch
  - Submit creates workspace via top-level POST /workspaces/
- Add createWorkspaceTopLevel() API client for flat endpoint
- Works even with zero existing workspaces (shows create button in empty state)
- Add CSS grid layout for inline create form
- TypeScript + eslint clean

apps/web/src/components/workspace-card.tsx

@@ -28,7 +28,10 @@ export function WorkspaceCard({
 
 	return (
 		<article className={`card workspace-card ${loading ? "loading" : ""}`}>
-			<Link to={`/workspaces/${workspace.id}`} className="workspace-header-link">
+			<Link
+				to={`/workspaces/${workspace.id}`}
+				className="workspace-header-link"
+			>
 				<div className="workspace-header">
 					<h4>{workspace.name}</h4>
 					<span className={`status-badge ${statusClass}`}>