feat(coding-agent): add automatic theme mode (#5874)

packages/coding-agent/test/suite/regressions/5080-signal-shutdown-extension-cleanup.test.ts

@@ -21,6 +21,7 @@ type ShutdownThis = {
 	unregisterSignalHandlers: () => void;
 	runtimeHost: { dispose: () => Promise<void> };
 	ui: { terminal: { drainInput: (ms: number) => Promise<void> } };
+	themeController: { disableAutoSync: () => void };
 	stop: () => void;
 	sessionManager: SessionManager;
 };
@@ -81,6 +82,7 @@ function createContext(order: string[], sessionManager = createSessionManager())
 				}),
 			},
 		},
+		themeController: { disableAutoSync: vi.fn() },
 		stop: vi.fn(() => {
 			order.push("stop");
 		}),

packages/coding-agent/test/suite/regressions/5724-sigterm-signal-exit.test.ts

@@ -13,6 +13,7 @@ type ShutdownThis = {
 	unregisterSignalHandlers: () => void;
 	runtimeHost: { dispose: () => Promise<void> };
 	ui: { terminal: { drainInput: (ms: number) => Promise<void> } };
+	themeController: { disableAutoSync: () => void };
 	stop: () => void;
 };
 
@@ -73,6 +74,7 @@ describe("InteractiveMode SIGTERM shutdown with signal-exit (#5724)", () => {
 					}),
 				},
 			},
+			themeController: { disableAutoSync: vi.fn() },
 			stop: vi.fn(() => {
 				order.push("stop");
 			}),