feat: implement URL-based search param syncing for filters

[shreyashchandratre]

Closes #90
Description
Implements URL-based search parameter syncing for the Havenly filter system. Previously, all filter state (price range, rating, property type, category, sort order) lived in local component state — meaning filters reset on every page refresh and filtered views couldn't be shared via URL.

This PR replaces that local state with a useFilterParams custom hook backed by useSearchParams and useRouter from next/navigation. Filter state is now serialized into the URL on every change and deserialized on mount, making filtered views both persistent and shareable.

Changes Made
hooks/use-filter-params.ts — new custom hook that owns all URL read/write logic for filters. Uses router.replace (not push) to avoid polluting browser history. Removes a key from the URL when its value equals the default, keeping URLs clean. Preserves non-filter params (city, checkIn, checkOut, guests) on every update and on clear.

components/FilterSidebar.tsx — refactored to be fully prop-driven. Removed internal useState for price range, rating, and property type. Now receives filters and onFiltersChange props from the parent. Property type checkboxes properly wired with toggle behaviour.

app/properties/page.tsx — wired to useFilterParams. Removed local state for sortBy, priceFilter, and ratingFilter. Sort dropdown and sidebar both sync to URL. Wrapped in as required by Next.js when useSearchParams is used.

app/page.tsx — category filter on the home page now syncs to the URL. Removed selectedCategory state and useRouter manual navigation. clearFilters() from the hook replaces the old router.push('/').

vitest.config.mts + vitest.setup.ts — test config set up with jsdom environment and @testing-library/react.

hooks/tests/use-filter-params.test.ts — 16 unit tests covering deserialization (valid values, fallbacks for invalid/missing params), setFilters URL writes, default-value key removal, and clearFilters non-filter param preservation.

components/tests/FilterSidebar.test.tsx — 7 unit tests verifying prop-driven rendering and that onFiltersChange is called correctly on user interaction.

How to Test
Run npm run dev and navigate to /properties
Select a price range, rating, or property type — verify the URL updates immediately (e.g. ?maxPrice=300&rating=4.5)
Refresh the page — filters should remain active, matching what's in the URL
Copy the URL and open it in a new tab — the same filters should be applied
Clear all filters — verify all filter params are removed from the URL, and non-filter params like city are preserved if present
On the home page (/), select a category — verify ?category=beachfront (or similar) appears in the URL and persists on refresh
Run npm test — all 32 tests should pass

[vercel]

@shreyashchandratre is attempting to deploy a commit to the Akshay Kumar's projects Team on Vercel.

A member of the Team first needs to authorize it.

[shreyashchandratre]

Hi maintainers! My first PR is ready for review. It looks like the Vercel deployment check needs authorization from a team member to build the preview. Whenever you have a moment to approve it, let me know if any other tests need attention. Thanks!

[akshay0611]

Hi @shreyashchandratre

Kindly complete the below Checklist:

🏕️ Explorer Checklist
⭐ Star this repository
👀 Follow the maintainer
📖 Review the README.md
📚 Review the CONTRIBUTING.md

[akshay0611]

Hi @shreyashchandratre

Kindly complete all the below points mentioned in the Checklist:

🏕️ Explorer Checklist
⭐ Star this repository
👀 Follow the maintainer
📖 Review the README.md
📚 Review the CONTRIBUTING.md