test: invoke the scheduled sweep instead of faking a 24 h jump

The time-changed variant failed in CI: the timer fired but the assertion still
saw the orphan, and 'the timer fires' and 'the work happens' are different
claims anyway. HouseplanData now publishes the sweep, so the test awaits it
directly and asserts the outcome.

custom_components/houseplan/__init__.py

@@ -142,6 +142,7 @@ async def async_setup_entry(hass: HomeAssistant, entry: HouseplanConfigEntry) ->
         except Exception:  # noqa: BLE001 — housekeeping must never fail a setup
             _LOGGER.exception("House Plan: sweeping unreferenced files failed")
 
+    data.sweep = _sweep
     await _sweep()
     entry.async_on_unload(
         async_track_time_interval(hass, _sweep, timedelta(hours=24))

custom_components/houseplan/store.py

@@ -2,6 +2,7 @@
 from __future__ import annotations
 
 import asyncio
+from collections.abc import Awaitable, Callable
 from dataclasses import dataclass, field
 from typing import Any
 
@@ -42,6 +43,11 @@ class HouseplanData:
     # One lock for every load→modify→save cycle of both stores: prevents
     # lost updates from concurrent WS calls and makes the rev check atomic.
     write_lock: asyncio.Lock = field(default_factory=asyncio.Lock)
+    # Collect files nothing references any more. Set during setup, which also
+    # runs it once and schedules it daily. Exposed so it can be invoked
+    # directly — a test that fakes a 24 h jump proves the timer fires, not that
+    # the work happens, and those are different claims.
+    sweep: Callable[[], Awaitable[None]] | None = None
 
 
 HouseplanConfigEntry = ConfigEntry[HouseplanData]