Task #24: Remember the admin's last-used dashboard time range.
The admin dashboard's range selector (7d/30d/90d/custom) was resetting to
"Last 7 days" on every visit. Now the selected preset range is persisted in
localStorage under a per-user key (`admin.statsRange.<userId>`) so each admin
sees their last choice on return.
Implementation notes:
- Edited only artifacts/teaboy-os/src/pages/admin.tsx.
- Added two effects: one hydrates the stored value once `user.id` is
available (auth loads asynchronously), the other writes to localStorage
whenever the range changes after hydration.
- Only the preset values (7d/30d/90d) are persisted; "custom" is intentionally
not stored since the custom dates are session-scoped and would feel stale on
return. After hydration, switching to "custom" leaves the previously stored
preset untouched so the next visit still restores the last preset.
- Used a hydration guard to avoid clobbering stored values with the default
"7d" before the load effect runs.
Replit-Task-Id: a29d7e30-8111-4edd-9307-3262c4dbc236
riyadhafraa
8d90771409