feat: default session name to '{workspace} {tool_type}', improve terminal tab title

ToolStarter:
- Auto-populate Session Name as '{workspace.name} {tool_type.display_name}'
  when a tool type is selected
- Track whether user has manually edited the name (nameEdited flag) to avoid
  overwriting their custom input

Terminal page:
- Fetch instance display_name via getUserSessions for tab title
- Tab title format: '{display_name} {terminal_session_name} — Terminal'
  instead of just '{session_name} — Terminal'

Quality gates: tsc --noEmit pass, npm run build pass, 82/82 tests pass

apps/web/src/api/sessions.ts

@@ -161,6 +161,17 @@ export async function deleteInstance(
 	);
 }
 
+export async function getInstance(
+	projectId: string,
+	repoId: string,
+	instanceId: string,
+): Promise<ToolInstance> {
+	const response = await apiClient.get(
+		`/projects/${projectId}/repositories/${repoId}/instances/${instanceId}`,
+	);
+	return response.data;
+}
+
 export async function getUserSessions(): Promise<Session[]> {
 	const response = await apiClient.get("/users/me/sessions");
 	return response.data.sessions;