feat: improve session naming, project display, rename support, tab titles

Backend:
- sessions.py: include workspace_name in session response
- instance_service.py: auto-generate display names as
  'Project / Workspace / Tool #N' instead of 'Workspace / Tool #N'
- instance_service.py: add rename_tool_instance() service function
- tool_instances.py: add PATCH /instances/{id} endpoint for renaming
  display_name

Frontend:
- api/sessions.ts: add workspace_name to Session type, add renameInstance()
- use-instance-actions.ts: add handleRename, set document.title when opening
- session-card.tsx: click-to-edit display_name inline; always show project
  context line (Project / Workspace or Repo / Tool)
- session-list.tsx: pass through onRename prop
- SessionsPage.tsx: wire handleRename to SessionCard and SessionList
- app-shell.tsx: sidebar tooltip includes workspace or repo name
- use-terminal-page.ts: set document.title based on active terminal session

Quality gates: py_compile all backend files pass, tsc --noEmit pass,
npm run build pass, 82/82 tests pass

apps/web/src/components/features/session/session-card.tsx

@@ -12,6 +12,7 @@ export interface SessionCardProps {
 	onStop?: (session: Session) => void;
 	onDelete?: (session: Session) => void;
 	onRecreateTunnel?: (session: Session) => void;
+	onRename?: (session: Session, newName: string) => void;
 	isBusy?: boolean;
 	tunnelHealth?: {
 		healthy: boolean;
@@ -43,12 +44,15 @@ export function SessionCard({
 	onStop,
 	onDelete,
 	onRecreateTunnel,
+	onRename,
 	isBusy = false,
 	tunnelHealth = null,
 }: SessionCardProps) {
 	const [showStopConfirm, setShowStopConfirm] = useState(false);
 	const [showDeleteConfirm, setShowDeleteConfirm] = useState(false);
 	const [showActionSheet, setShowActionSheet] = useState(false);
+	const [isEditingName, setIsEditingName] = useState(false);
+	const [editName, setEditName] = useState(session.display_name);
 	const isMobile = useMobileViewport();
 
 	const status = statusConfig[session.status] || {
@@ -103,7 +107,43 @@ export function SessionCard({
 			<div className="session-card-content">
 				<div className="session-card-header">
 					<div className="session-card-title">
-						<h4>{session.display_name}</h4>
+						{isEditingName ? (
+							<div className="session-card-rename">
+								<input
+									type="text"
+									value={editName}
+									onChange={(e) => setEditName(e.target.value)}
+									onKeyDown={(e) => {
+										if (e.key === "Enter") {
+											onRename?.(session, editName);
+											setIsEditingName(false);
+										}
+										if (e.key === "Escape") {
+											setEditName(session.display_name);
+											setIsEditingName(false);
+										}
+									}}
+									onBlur={() => {
+										if (editName.trim() && editName !== session.display_name) {
+											onRename?.(session, editName);
+										}
+										setIsEditingName(false);
+									}}
+									autoFocus
+								/>
+							</div>
+						) : (
+							<h4
+								onClick={() => {
+									setEditName(session.display_name);
+									setIsEditingName(true);
+								}}
+								title="Click to rename"
+								style={{ cursor: "pointer" }}
+							>
+								{session.display_name}
+							</h4>
+						)}
 						<div className="session-card-status-badges">
 							<span className={`status-badge ${status.color}`}>
 								{status.label}
@@ -118,10 +158,22 @@ export function SessionCard({
 							)}
 						</div>
 					</div>
-					<p className="muted session-card-meta">
-						{session.tool_type_name}
-						{session.project_name && ` · ${session.project_name}`}
-						{session.repository_name && ` · ${session.repository_name}`}
+					<p className="muted session-card-meta session-card-context">
+						<strong>{session.project_name}</strong>
+						{session.workspace_name && (
+							<>
+								{" "}
+								/ <span>{session.workspace_name}</span>
+							</>
+						)}
+						{!session.workspace_name && session.repository_name && (
+							<>
+								{" "}
+								/ <span>{session.repository_name}</span>
+							</>
+						)}
+						{" "}
+						· {session.tool_type_name}
 					</p>
 					{session.clone_mode && (
 						<p className="muted session-card-meta">

apps/web/src/components/features/session/session-list.tsx

@@ -9,6 +9,7 @@ export interface SessionListProps {
   onStop?: (session: Session) => void;
   onDelete?: (session: Session) => void;
   onRecreateTunnel?: (session: Session) => void;
+  onRename?: (session: Session, newName: string) => void;
   actionBusyId?: string | null;
   tunnelHealth?: Record<string, InstanceHealth>;
   showGrouping?: boolean;
@@ -28,6 +29,7 @@ export function SessionList({
   onStop,
   onDelete,
   onRecreateTunnel,
+  onRename,
   actionBusyId = null,
   tunnelHealth = {},
   showGrouping = true,
@@ -56,6 +58,7 @@ export function SessionList({
               onStop={onStop}
               onDelete={onDelete}
               onRecreateTunnel={onRecreateTunnel}
+              onRename={onRename}
               isBusy={actionBusyId === session.id}
               tunnelHealth={tunnelHealth[session.id] || null}
             />
@@ -88,6 +91,7 @@ export function SessionList({
                 onStop={onStop}
                 onDelete={onDelete}
                 onRecreateTunnel={onRecreateTunnel}
+                onRename={onRename}
                 isBusy={actionBusyId === session.id}
                 tunnelHealth={tunnelHealth[session.id] || null}
               />
@@ -113,6 +117,7 @@ export function SessionList({
                 onStop={onStop}
                 onDelete={onDelete}
                 onRecreateTunnel={onRecreateTunnel}
+                onRename={onRename}
                 isBusy={actionBusyId === session.id}
                 tunnelHealth={tunnelHealth[session.id] || null}
               />