revert: undo keyboard-first navigation (#3963)

[devin-ai-integration]

Summary

Reverts all changes from PR #3963 ("support keyboard-first navigation"). This was done via git revert with one manual conflict resolution in packages/store/src/zod.ts.

Key reversions:

• Removes useSettingsNavigation hook and all data-settings-item/data-settings-activate data attributes
• Removes ctrl+alt+left/right sub-tab keyboard navigation from AI and Settings views
• Removes keyboard highlight CSS
• Restores aiProviderSchema to use z.url().min(1) with the .refine() check requiring API keys for HTTPS URLs (conflict resolution — HEAD had simplified this to z.string())

Review & Testing Checklist for Human

• Verify zod.ts conflict resolution: The revert restores z.url().min(1) and the .refine() for HTTPS API key enforcement. PR support keyboard-first navigation #3963 comment landing v0 #7 noted this validation caused a UX bug ("if you clear the field, it shows an error message and when you open it again, it has 4 letters typed in"). Confirm this is acceptable or if base_url should stay as z.string() instead.
• Test AI provider settings form: Open Settings → AI, try adding/editing a provider. Ensure the form behaves correctly with the restored URL validation.
• Confirm no keyboard nav artifacts remain: Verify no data-settings-item attributes or highlight styles are left in the app.

Notes

Requested by: @ComputelessComputer
Link to Devin run

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