feat: add delayed prompt modal

src/hqt/tui/screens/schedule_prompt.py

@@ -0,0 +1,67 @@
+import re
+from datetime import timedelta
+
+from textual.app import ComposeResult
+from textual.containers import Horizontal, Vertical
+from textual.screen import ModalScreen
+from textual.widgets import Button, Input, Label
+
+
+_DELAY_RE = re.compile(
+    r"^(?:(?P<hours>\d+)h)?(?:(?P<minutes>\d+)m)?(?:(?P<seconds>\d+)s)?$"
+)
+
+
+def parse_delay(value: str) -> timedelta:
+    match = _DELAY_RE.fullmatch(value)
+    if match is None or not value:
+        raise ValueError("invalid delay")
+
+    total_seconds = (
+        int(match.group("hours") or 0) * 3600
+        + int(match.group("minutes") or 0) * 60
+        + int(match.group("seconds") or 0)
+    )
+    if total_seconds <= 0:
+        raise ValueError("invalid delay")
+    return timedelta(seconds=total_seconds)
+
+
+class SchedulePromptScreen(ModalScreen[tuple[str, timedelta] | None]):
+    def compose(self) -> ComposeResult:
+        with Vertical(id="schedule-prompt-dialog"):
+            yield Label("Schedule Prompt")
+            yield Label("Prompt:")
+            yield Input(placeholder="prompt to send later", id="prompt-input")
+            yield Label("Delay:")
+            yield Input(placeholder="30m", id="delay-input")
+            yield Label("", id="schedule-error")
+            with Horizontal(classes="dialog-actions"):
+                yield Button("OK", variant="primary", id="ok-btn")
+                yield Button("Cancel", id="cancel-btn")
+
+    def on_button_pressed(self, event: Button.Pressed) -> None:
+        if event.button.id == "ok-btn":
+            self._submit()
+        else:
+            self.dismiss(None)
+
+    def on_input_submitted(self, event: Input.Submitted) -> None:
+        self._submit()
+
+    def _submit(self) -> None:
+        prompt = self.query_one("#prompt-input", Input).value.strip()
+        if not prompt:
+            self._set_error("Prompt cannot be empty")
+            return
+
+        try:
+            delay = parse_delay(self.query_one("#delay-input", Input).value.strip())
+        except ValueError:
+            self._set_error("Use a delay like 90s, 30m, 2h, or 1h30m")
+            return
+
+        self.dismiss((prompt, delay))
+
+    def _set_error(self, message: str) -> None:
+        self.query_one("#schedule-error", Label).update(message)

src/hqt/tui/styles.tcss

@@ -23,11 +23,11 @@ SessionList {
     background: $background;
 }
 
-ProjectFormScreen, NewSessionScreen {
+ProjectFormScreen, NewSessionScreen, SchedulePromptScreen {
     align: center middle;
 }
 
-#project-form-dialog, #new-session-dialog {
+#project-form-dialog, #new-session-dialog, #schedule-prompt-dialog {
     width: 60;
     height: auto;
     padding: 1 2;
@@ -35,6 +35,11 @@ ProjectFormScreen, NewSessionScreen {
     border: solid $border;
 }
 
+#schedule-error {
+    color: $error;
+    height: 1;
+}
+
 /* Action row: flat, single-row buttons in a centered row. Textual's default
    Button uses `tall` top/bottom borders, which force a 3-row beveled "block"
    that reads as heavy and dated. Dropping the bevel (border: none) collapses

tests/test_tui.py

@@ -1050,6 +1050,80 @@ async def test_session_list_renders_harness_name_brackets():
         assert any("[claude]" in t for t in texts), f"harness name missing: {texts}"
 
 
+# ---------------------------------------------------------------------------
+# SchedulePromptScreen: parse + submit
+# ---------------------------------------------------------------------------
+
+
+def test_parse_delay_accepts_compact_seconds_minutes_hours():
+    from datetime import timedelta
+
+    from hqt.tui.screens.schedule_prompt import parse_delay
+
+    assert parse_delay("90s") == timedelta(seconds=90)
+    assert parse_delay("30m") == timedelta(minutes=30)
+    assert parse_delay("2h") == timedelta(hours=2)
+    assert parse_delay("1h30m") == timedelta(hours=1, minutes=30)
+
+
+@pytest.mark.parametrize("value", ["", "0m", "abc", "1d", "1h 30m"])
+def test_parse_delay_rejects_invalid_values(value):
+    from hqt.tui.screens.schedule_prompt import parse_delay
+
+    with pytest.raises(ValueError):
+        parse_delay(value)
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("submit_action", ["enter", "ok"])
+async def test_schedule_prompt_screen_submits_prompt_and_delay(submit_action):
+    from datetime import timedelta
+
+    from hqt.tui.screens.schedule_prompt import SchedulePromptScreen
+    from textual.widgets import Button, Input
+
+    app = HqtApp()
+    async with app.run_test(size=(120, 40)) as pilot:
+        results = []
+        app.push_screen(SchedulePromptScreen(), results.append)
+        await pilot.pause()
+
+        prompt = app.screen.query_one("#prompt-input", Input)
+        prompt.value = "continue work"
+        app.screen.query_one("#delay-input", Input).value = "1h30m"
+        prompt.focus()
+        await pilot.pause()
+        if submit_action == "enter":
+            await pilot.press("enter")
+        else:
+            app.screen.query_one("#ok-btn", Button).press()
+        await pilot.pause()
+
+        assert results == [("continue work", timedelta(hours=1, minutes=30))]
+
+
+@pytest.mark.asyncio
+async def test_schedule_prompt_screen_invalid_delay_stays_open_with_error():
+    from hqt.tui.screens.schedule_prompt import SchedulePromptScreen
+    from textual.widgets import Button, Input, Label
+
+    app = HqtApp()
+    async with app.run_test(size=(120, 40)) as pilot:
+        results = []
+        app.push_screen(SchedulePromptScreen(), results.append)
+        await pilot.pause()
+
+        app.screen.query_one("#prompt-input", Input).value = "continue work"
+        app.screen.query_one("#delay-input", Input).value = "1h 30m"
+        app.screen.query_one("#ok-btn", Button).press()
+        await pilot.pause()
+
+        assert isinstance(app.screen, SchedulePromptScreen)
+        assert results == []
+        error = app.screen.query_one("#schedule-error", Label)
+        assert "Use a delay like" in str(error.render())
+
+
 # ---------------------------------------------------------------------------
 # RenameSessionScreen: prefill + submit
 # ---------------------------------------------------------------------------