Fix theme selection bug and update onboarding with AppTheme picker

- Change Theme enum from Int to String raw values to fix theme selection bug
- Replace OnboardingStyle icon/color pickers with unified AppTheme grid
- Remove visible text labels from voting layouts while keeping accessibility labels (WCAG 2.1 AA compliant)
- Update widget voting views to use icons only with proper accessibility support
- Consolidate app icons to single unified icon set

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

FeelsWidget2/WidgetBundle.swift

@@ -12,7 +12,7 @@ import SwiftUI
 struct FeelsBundle: WidgetBundle {
     var body: some Widget {
         FeelsWidget()
-        FeelsGraphicWidget()
+//        FeelsGraphicWidget()
         FeelsIconWidget()
         FeelsVoteWidget()
         FeelsMoodControlWidget()