Fix three period entry bugs: backup export labels, delete cleanup, flow save

[mapgie]

Summary

• Bug 1 (backup export): Full backup export was exporting scaleLabels in the JSON but the import path (importCategoryConfig) called addCategory() and updateCategoryFullSettings() which both lacked a scaleLabels parameter, silently dropping slider labels and slider-scale status on restore. Added the parameter to both functions in TrackingRepository and wired the value through the import path in SettingsViewModel.

• Bug 2 (delete cleanup): Deleting a period entry (via the edit screen or swipe-to-delete in History) left its associated tracking logs orphaned in tracking_logs — flow logs for every day of the period, the symptoms log, and any pinned-category logs. Added deleteLogsForCategoryInRange() and deleteLogsForCategoryOnDate() to TrackingLogDao, a deleteLogsForPeriod() helper to TrackingRepository, and called it from both delete paths: LogPeriodViewModel.delete() and HistoryViewModel.stageDeletion(). The HistoryViewModel.Factory now accepts a TrackingRepository dependency, wired up in MainActivity.

• Bug 3 (flow save + historical repair): LogPeriodViewModel.save() was hardcoding flowLevel = "" instead of state.selectedFlowLabel, breaking JSON/CSV export and the doctor-visit summary for all periods saved during the bug window. Fixed the save call. The tracking log path (syncFlowToTrackingLog) was unaffected and recorded the correct value throughout. Added a one-time reverse migration (runFlowLevelRestoreIfNeeded in GoFloApplication) that reads the flow TrackingLog for each period with a blank flowLevel and writes the resolved label back to PeriodEntry, repairing historic records. Numeric slider values ("1"-"4") are mapped back to their text labels ("Spotting"/"Light"/"Medium"/"Heavy"). Guarded by a new flowLevelRestoreDone preference flag.

Test plan

• Export a full backup containing a numeric slider category with scale labels; restore it on a clean install and confirm the slider labels and slider-scale status are preserved
• Log a period with flow and symptoms; delete it from the edit screen; confirm flow, symptoms, and pinned-category tracking logs are all removed
• Log a period with flow and symptoms; swipe-to-delete from History; confirm the same cleanup occurs; tap Undo and confirm the period is restored (tracking logs are not restored on undo, which is the accepted behaviour)
• Log a new period; confirm PeriodEntry.flowLevel is non-blank (check via CSV or JSON export)
• On a device that has periods with blank flowLevel from before this fix, upgrade and confirm the one-time migration restores the correct label from the tracking log

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