fix: Improve Organization Page Styling & Performance Optimization

[mel-cell]

Changes

• Performance Optimization: Implemented ISR (Incremental Static Regeneration) with revalidate = 3600 (1 hour) on the Organization page. This resolves the slow data loading issue by caching the page content.
• UI/UX Improvements:
  • Redesigned the Period Selector dropdown:
    • Changed to a modern "pill" shape (rounded-full).
    • Applied a clean white background with subtle shadows to fix the "annoying gray" look.
    • Repositioned to the right side (justify-end) for better visual hierarchy.
  • Reverted the Organization list layout to the original design as requested.
• Database:
  • Removed temporary mock data and try-catch blocks.
  • Restored direct Prisma queries to ensure real data is always displayed.

Fixes

• Fixed "lemot" (slow loading) issues on the Organization page.
• Fixed styling inconsistencies in the filter selection component.