feat: add advanced project filtering and sorting

[samuelelijah585]

Overview

This PR adds an advanced Project Filtering and Sorting system to the project discovery dashboard. Users can now filter by budget range (min/max), project status, and required skill tags, sort results by newest, budget, or deadline, and reset everything with a single clear-all action — with filters persisted in URL query parameters for refreshable and shareable links.

Related Issue

Closes #

Changes

🔍 Advanced Project Filtering & Sorting

• [MODIFY] app/dashboard/projects/page.tsx

  • Adds client-side filter state synced with URL query parameters (budget min/max, status, required skills, sort).
  • Implements a responsive filter drawer optimized for mobile, with a one-click clear-all-filters action.
  • Adds loading skeletons and an empty-state message when no projects match the active filters.

• [MODIFY] lib/projects.ts

  • Expands filtering logic: budget range filtering, project status matching, and multi-select required skills.
  • Adds sort options: newest first, budget (asc/desc), and deadline (asc/desc).

• [MODIFY] app/api/projects/route.ts

  • Accepts filter and sort query parameters, returning properly ordered results.
  • Debounces rapid filter changes to prevent excessive API calls during typing.

• [MODIFY] components/dashboard/project-card.tsx

  • Displays skill tags and status badges so users can easily see why a project matched their filters.

Verification Results

npm run lint && npm run build
✅ Passed

Live acceptance check:
✅ Responsive filter drawer on mobile
✅ Loading skeleton shown during debounced fetch
✅ Empty state message when no projects match
✅ Filters persist and restore from URL query params
✅ Sorting works consistently (newest, budget asc/desc, deadline asc/desc)
✅ Clear-all resets every filter in one action

Acceptance Criteria	Status
Responsive filter drawer on mobile	✅ Collapsible drawer optimized for small screens
Loading states	✅ Skeleton shown while results are fetched
Empty states	✅ Clear messaging when no projects match filters
Debounced search/filter requests	✅ Requests debounced to prevent excessive API calls
Filters persist via URL query parameters	✅ Refreshing or sharing the link restores applied filters
Sorting works consistently	✅ Newest, budget asc/desc, deadline asc/desc ordered correctly

Closes #181