Fix browser compatibility: guard requestIdleCallback and startViewTransition

[N2D4]

Add feature checks for two browser APIs that aren't universally supported:

• requestIdleCallback: Falls back to setTimeout on browsers that don't support it (e.g. Safari)
• document.startViewTransition: Applies the theme change directly when the View Transitions API is unavailable

Link to Devin session: https://app.devin.ai/sessions/c77b612db7834e9aa71c6b5a0fde316b
Requested by: @N2D4

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