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* style(app): theme native scrollbars in tool call detail views Apply CSS scrollbar-color to all ScrollViews in ToolCallDetailsContent and DiffViewer so the browser scrollbar matches the app's dark theme instead of showing the default white native scrollbar. * refactor: split useWebScrollbarStyle into .web.ts/.native.ts platform files - Native shim returns undefined without calling useUnistyles - Web variant uses properly typed WebScrollbarStyle interface instead of `as any` - Add .d.ts for TypeScript module resolution --------- Co-authored-by: Mohamed Boudra <boudra.moha@gmail.com>