Add period tracking toggle and pregnancy mode warning

[mapgie]

Summary

• Track period toggle in Tracking Modes. A new "Track period" card appears first in the Tracking Modes list, enabled by default. Toggling it off hides the Log Period button from the speed dial and redirects the FAB quick-log action to open the speed dial instead of navigating to the period log screen. Toggling it back on restores everything.
• 3-dot menu on the period logging screen. A "Disable period logging" option in the overflow menu does the same as the Tracking Modes toggle and navigates back.
• Pregnancy activation warning. When the user activates Pregnancy Tracking while period logging is on, a confirmation dialog explains that period logging will be paused and any categories pinned to the period log will be archived automatically. Clicking Continue disables period logging, archives those categories, then proceeds to the normal activation sheet. Clicking Cancel aborts.

Implementation notes

• periodTrackingEnabled is a new DataStore preference (default true). No DB schema change.
• The archiving on pregnancy activation calls the existing archiveCategory() path on each non-system category returned by the existing getShowInLogPeriodCategoriesOnce() DAO query.
• Flow and Symptoms (system categories hardcoded in the period log screen) are unaffected by the archive operation since they carry showInLogPeriod = false.
• Period history data and calendar markers remain visible when period tracking is disabled; only the interactive logging entry points are hidden.

Test plan

• Open Tracking Modes. Confirm "Track period" toggle appears first, is on by default, and visually matches the mode cards.
• Toggle "Track period" off. Confirm the Log Period item disappears from the speed dial and tapping the FAB opens the speed dial instead of the period log screen.
• Toggle "Track period" back on. Confirm Log Period returns in the speed dial.
• Open the period logging screen. Confirm the three-dot menu appears and "Disable period logging" turns off period tracking and navigates back.
• Activate Pregnancy Tracking when period logging is on. Confirm the warning dialog appears, Cancel aborts, Continue disables period logging and proceeds to the activation sheet.
• Add a category with "Log with period" enabled, then activate Pregnancy Tracking. Confirm that category is archived after confirming the dialog.
• Re-enable period tracking. Confirm no crashes; previously archived categories remain archived (user must manually unarchive).

https://claude.ai/code/session_01WNRZUGk5XKqSUAWTVBuZGg

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