feat: add SharedPreferences storage for macOS/iOS

[0Chencc]

Summary

• Add alternative SharedPreferences-based storage for auth tokens and credentials
• Provides fallback for platforms where Keychain/SecureStorage is problematic during development
• Update iOS/macOS platform configurations and entitlements

Test plan

• Verify token storage works on macOS
• Verify credentials storage works on iOS simulator
• Confirm existing secure storage still functions on production builds

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.42%. Comparing base (88fc4e0) to head (dfe708a).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #3   +/-   ##
=======================================
  Coverage   71.42%   71.42%           
=======================================
  Files           1        1           
  Lines           7        7           
=======================================
  Hits            5        5           
  Misses          2        2           

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