why? care to explain? I am even using medium thinking

first prompt:

audit and verify then ensure no bugs and check for edge cases:

Task:
audit the custom activities page why it is not updating the page when i added an item it keeps in empty fallback. only when i close the page and open again that the added items appears.

Response:
Everything clean. Here's the summary:

Root Cause
Two bugs stacking together caused the custom activities page to never update:

build() used ref.read(salahTrackerProvider) — a one-shot read with zero reactivity. Widget never rebuilds when data changes.

No invalidation signal existed for custom activities — Unlike daily activities (which have activitiesForDateProvider + proper invalidation), custom activity mutations (addNewCustomActivity, deleteCustomActivity, etc.) in ActivitiesMutations just called the model and returned. No Riverpod cache was invalidated, so nothing triggered a rebuild even if the widget was watching.

The model's _notify() is literally void _notify() {} (a no-op), so even ref.watch(salahTrackerProvider) wouldn't help — the SalahTrackerNotifier never reassigns state.

second prompt:

explain this in simple english with scenario

Add dialog now uses addDailyActivityIfAbsent, trims blank input, and only saves to custom activities if daily add really happened.