feat: mobile notifs first pass

[danctila]

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactoring (code improvement without changing functionality)
• Documentation update
• Configuration/infrastructure change
• Performance improvement
• Test coverage improvement

Screenshots/Recordings

CleanShot.2026-04-15.at.22.40.20.mp4

CleanShot.2026-04-14.at.21.32.57.mp4

[codecov]

Codecov Report

❌ Patch coverage is 7.69231% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 7.19%. Comparing base (ce594ee) to head (e08ba17).
⚠️ Report is 17 commits behind head on main.

Files with missing lines	Patch %	Lines
backend/internal/repository/notifications.go	0.00%	19 Missing ⚠️
backend/internal/handler/notifications.go	28.57%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main    #350      +/-   ##
========================================
+ Coverage   3.12%   7.19%   +4.07%     
========================================
  Files        110     180      +70     
  Lines       6081   10056    +3975     
  Branches      19      29      +10     
========================================
+ Hits         190     724     +534     
- Misses      5890    9307    +3417     
- Partials       1      25      +24     

Flag	Coverage Δ
backend	14.63% <7.69%> (?)
mobile	97.29% <ø> (?)
web	2.88% <ø> (-0.25%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
backend/internal/handler/notifications.go	83.72% <28.57%> (ø)
backend/internal/repository/notifications.go	0.00% <0.00%> (ø)

... and 82 files with indirect coverage changes

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[Dao-Ho]

Just one nit/ consideration