- Added `SetupTab` abstractions and wired Sign-In/Web-Search tabs under the new providers onboarding scene.
- Added `providersSetupScene` and swapped `providerSetupScene` for `providers` in setup-wizard scene registration.
- Added `WebSearchTab` option loading, provider availability checks, and persisted selected search-provider preference.
- Changed sign-in flow handling to keep the scene active across providers and support cancellation during authentication.
- Changed glyph-mode picker initialization and rendering to preselect current preset and show live symbol previews.
- Updated setup wizard tests to use the `providers` scene id and cover the new web search tab path.
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