Spam banner: apply larger interval each time it is shown

[chibenwa]

Problem: The spam banner was only storing a timestamp when the user explicitly dismissed it (close button or "view spam"). If the user manually marked spam emails as read instead, no timestamp was
stored, so the banner would reappear on every app resume.

Fix in get_spam_mailbox_cached_interactor.dart:

• Changed interval from 12 → 24 hours to match the "max once per day" spec
• Added storeLastTimeDismissedSpamReported(DateTime.now()) at the moment the banner is shown, not just when dismissed

Now the 24h cooldown starts as soon as the banner is displayed, regardless of how the user handles it.

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[chibenwa]

Cc @hoangdat

[dab246]

Hi @chibenwa , I tried running your PR but it doesn't seem to be working as expected (see demo video). In my opinion, the logic for displaying this Spam banner also has many necessary conditions, so your fix isn't working. If you don't mind, we can help you fix this issue.

Screen.Recording.2026-03-19.at.13.48.23.mov

[chibenwa]

I tried running your PR but it doesn't seem to be working as expected (see demo video)
we can help you fix this issue.

Please ;-)