[laddyr141-ui]

Summary

• Implement responsive design for mobile and tablet devices #894: Fixed a genuine responsive-design gap — the version-comparison diff modal (ComparisonView in src/components/VersionHistory.tsx) was hardcoded to a 2-column grid, which crammed two font-mono diff columns side by side even on narrow mobile viewports. Changed to grid-cols-1 sm:grid-cols-2 so columns stack on mobile, with matching padding tightened at small sizes.
• Add dark mode support with theme persistence #893: Skipped — dark mode with theme persistence already exists in full (ThemeContext.tsx, ThemeToggle, localStorage persistence, system-preference listener). Commented on the issue with details.
• Implement advanced search and filtering for invoices #892: Skipped — advanced invoice search/filtering already exists in full (status, date-range, tags, sort, saved presets, and a natural-language query parser with amount min/max support). Commented on the issue with details.
• Add data visualization dashboards for creators #895: Skipped — creator-facing data visualization dashboards already exist extensively via recharts (multiple chart components plus a dedicated analytics/ suite). Adding another chart risked being arbitrary rather than filling a real gap. Commented on the issue with details.

Closes #895
Closes #894
Closes #893
Closes #892

Test plan

• Open the version comparison modal on invoice history at a mobile viewport width (<640px) and confirm the before/after diff columns stack vertically instead of overflowing
• Confirm desktop (>=640px) still shows the 2-column side-by-side diff layout

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