Fix localStorage access throwing in restricted environments (#524)

[davidtruong]

Replace all direct localStorage calls with safeLocalStorage wrapper that detects availability and falls back to in-memory storage. This prevents crashes in mobile webviews and iOS Safari private browsing.

https://claude.ai/code/session_01GW85dHHX1Jv15PEoMqdiah

JIRA Ticket(s) if any

• MOB-XXXX

Description

Test Steps

[codecov-commenter]

Codecov Report

❌ Patch coverage is 84.88372% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.38%. Comparing base (190a168) to head (b618301).

Files with missing lines	Patch %	Lines
src/utils/localStorage.ts	67.85%	9 Missing ⚠️
src/utils/functions.ts	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #557      +/-   ##
==========================================
- Coverage   74.45%   74.38%   -0.07%     
==========================================
  Files          57       58       +1     
  Lines        2736     2768      +32     
  Branches      798      825      +27     
==========================================
+ Hits         2037     2059      +22     
+ Misses        698      668      -30     
- Partials        1       41      +40     

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[davidtruong]

Things are fixed