Add Flo Period Tracker app

[harimwoo]

Application Submission

• Flo Period Tracker — a menstrual cycle tracking app for Flipper Zero.
  • Status screen showing current cycle day, days until next period, and fertile window
  • Monthly calendar view with logged period days highlighted and predicted periods/fertile windows shown
  • Period logging with date and duration input via D-pad
  • Weighted average cycle length calculation that prioritizes recent cycles
  • Cycle variability tracking with irregularity warnings (standard deviation)
  • Multi-cycle lookahead predictions (up to 3 cycles ahead)
  • Configurable cycle length (20–45 days) and period duration (1–14 days)
  • Persistent storage to SD card

Extra Requirements

• N/A

Author Checklist (Fill this out)

• [X ] I've read the contribution guidelines and my PR follows them
• [X ] I own the code I'm submitting or have code owner's permission to submit it
• [X ] I have performed a self-review of my own code
• [X ] I have commented my code, particularly in hard-to-understand areas
• [ X] I have validated the manifest file(s) with python3 tools/bundle.py --nolint applications/CATEGORY/APPID/manifest.yml bundle.zip

AI usage disclosure (Fill this out):

• [X ] Partially AI assisted (clarify below which code was AI assisted and briefly explain what it does).

• Fully AI generated (explain what all the generated code does in moderate detail).

• AI was used for code review and refactoring. Specifically:

  • AI reviewed the initial codebase and identified bugs (broken save/cancel button handler, calendar off-screen rendering, duplicate period entries)
  • AI refactored the prediction model from a simple arithmetic mean to a weighted average that prioritizes recent cycles, and added standard deviation tracking for cycle variability
  • AI added helper functions for calendar predictions (flo_is_in_period, flo_is_predicted_period, flo_is_in_fertile_window) and multi-cycle lookahead
  • All code was reviewed and tested by the author

Reviewer Checklist (Don't fill this out!)

• Bundle is valid
• There are no obvious issues with the source code
• I've ran this application and verified its functionality

[xMasterX]

Hello, SAVE and CANCEL buttons in Log Period menu options are outside of the screen , being cut in half, other parts of app seems to be fine, if possible move other elements on that screen to fit those buttons, or use smaller font size for them

Also screenshots needs to be taken via qFlipper, current one is using wrong resolution and color scheme

After applying fix update commit sha here in manifest and tag me when its ready