Add invoice search/filtering, dark mode, responsive design, creator dashboards

[laddyr141-ui]

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

Summary of changes:

• Implement advanced search and filtering for invoices #892 Advanced search and filtering for invoices: the invoice search page already had full-text search, multi-dimension filters, and saved filter presets. Added search-result term highlighting, a smart suggestions dropdown (derived from recent/saved searches and common terms), and an active-filter-count badge.
• Add dark mode support with theme persistence #893 Dark mode: the app already ships a complete theme system (ThemeProvider/ThemeContext with light/dark/system modes, localStorage persistence, system-preference detection, and a ThemeToggle wired into the navbar and settings). Found and fixed one component (ExportModal) that was still hardcoded to light-mode colors, so it now themes correctly with the rest of the app.
• Implement responsive design for mobile and tablet devices #894 Responsive design: most pages/components already use responsive breakpoints, a mobile nav drawer, and overflow-x-auto for tables. Fixed the shared Modal component so it caps its height and scrolls on small screens instead of overflowing the viewport.
• Add data visualization dashboards for creators #895 Creator dashboards: the analytics dashboard already had weekly revenue, status breakdown, and unique-payers charts plus key metric tiles. Added drill-down: clicking a slice in the invoice status pie chart now opens a panel listing the matching invoices.

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