fix(tui): resolve call_in_thread union typing

Use the concrete ModeResult type when defining the CallInThread protocol so the CleverAgents CLI imports cleanly during Behave and Robot runs, and reformat the fallback quotes file to satisfy the formatter.\n\nRefs: #6357\n\n---\n**Automated by CleverAgents Bot**\nSupervisor: PR Fix Pool | Agent: pr-fix-worker

src/cleveragents/tui/app.py

@@ -30,9 +30,7 @@ if TYPE_CHECKING:
 else:
     InputSubmittedEvent = Any
 
-CallInThread = Callable[
-    [Callable[[], "ModeResult"]], Awaitable["ModeResult"] | "ModeResult"
-]
+CallInThread = Callable[[Callable[[], ModeResult]], Awaitable[ModeResult] | ModeResult]
 
 _TEXTUAL_AVAILABLE = False
 _TextualApp: type[Any] = object

src/cleveragents/tui/quotes.py

@@ -6,10 +6,10 @@ _DATA_PATH = Path(__file__).with_name("data").joinpath("throbber_quotes.txt")
 _FALLBACK_QUOTES: tuple[str, ...] = (
     "\"I'm sorry, Dave. I'm afraid I can't do that.\" — HAL 9000",
     (
-        "\"Any sufficiently advanced technology is indistinguishable from magic.\" "
+        '"Any sufficiently advanced technology is indistinguishable from magic." '
         "— Arthur C. Clarke"
     ),
-    "\"Logic is the beginning of wisdom, not the end.\" — Spock",
+    '"Logic is the beginning of wisdom, not the end." — Spock',
 )