fix(dashproof-lab): make success/error notices and toasts readable in light theme

[thephez]

Summary

• OperationResultNotice success/error tones used hardcoded dark oklch values, leaving dark text on a dark panel in light mode. Swapped them for --color-success-* / --color-error-* CSS variables defined per-theme in globals.css.
• Sonner <Toaster /> was rendering with its default theme regardless of the app theme. Now passes the active theme from useTheme() and enables richColors so success/error toasts use proper contrast in both modes.
• Tightened useTheme to use useSyncExternalStore<Theme> so the returned value stays narrowed to "light" | "dark" (needed for the new Toaster prop).

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5bcead3f-ddeb-42c5-a0f7-3e4a6b8c58ee

📥 Commits

Reviewing files that changed from the base of the PR and between fb19a9c and b9e0bd1.

📒 Files selected for processing (4)

• example-apps/dashproof-lab/src/App.tsx
• example-apps/dashproof-lab/src/components/OperationResultNotice.tsx
• example-apps/dashproof-lab/src/hooks/useTheme.ts
• example-apps/dashproof-lab/src/styles/globals.css

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• Create PR with unit tests
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