Update SsoButtons with official Google multicolor "G" (on white) and Microsoft four-square logo
Apply Google dark-theme button colors (#131314 / #8E918F / #E3E3E3) and Microsoft dark button styling
Use approved labels: Continue with Google / Sign up with Google, Sign in with Microsoft
Test plan
Sign In with Google + Microsoft OAuth enabled → both buttons show logos + correct labels
Sign Up → Google shows "Sign up with Google"; Microsoft shows "Sign in with Microsoft"
Click each button still starts existing OAuth redirect flow
Dark card contrast looks correct; Google "G" remains multicolor on white
npm test -- --watchAll=false --testPathPattern=SignIn.test --testPathPattern=SsoButtons.test passes
## Summary
- Closes [#79](https://git.aimloperations.com/ai_ml_operations/chat_web_app/issues/79)
- Update `SsoButtons` with official Google multicolor "G" (on white) and Microsoft four-square logo
- Apply Google dark-theme button colors (`#131314` / `#8E918F` / `#E3E3E3`) and Microsoft dark button styling
- Use approved labels: `Continue with Google` / `Sign up with Google`, `Sign in with Microsoft`
## Test plan
- [ ] Sign In with Google + Microsoft OAuth enabled → both buttons show logos + correct labels
- [ ] Sign Up → Google shows "Sign up with Google"; Microsoft shows "Sign in with Microsoft"
- [ ] Click each button still starts existing OAuth redirect flow
- [ ] Dark card contrast looks correct; Google "G" remains multicolor on white
- [ ] `npm test -- --watchAll=false --testPathPattern=SignIn.test --testPathPattern=SsoButtons.test` passes
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Summary
SsoButtonswith official Google multicolor "G" (on white) and Microsoft four-square logo#131314/#8E918F/#E3E3E3) and Microsoft dark button stylingContinue with Google/Sign up with Google,Sign in with MicrosoftTest plan
npm test -- --watchAll=false --testPathPattern=SignIn.test --testPathPattern=SsoButtons.testpasses