Add company filter to job filters

[MichaelChudLife]

Summary

Adds a Companies section to the job Filters modal (under Experience) that lets users hide specific companies from results, with a live per-company listing count. All companies are shown by default; users opt out of the ones they don't want to see.

• Each company shows a count that reflects all other active filters but not the company exclusion itself (standard faceted search).
• Uncheck a company (or use the chip ✕) to hide it; a single Clear restores all. Only the company filter is affected — other filters are preserved.
• State lives in the URL (excludedCompanies[]), so exclusions persist on reload and are cleared by Reset Filters.

Changes (by commit)

1. Filter state + URL — add excludedCompanies to JobFilters, parse/trim/dedupe it in the provider, include it in ResetFilters.
2. Backend — getCompanyFacets aggregates per-company counts ($group on company.name), exposed to the client via a "use server" wrapper; buildJobQuery applies an excludedCompanies $nin; the jobs cache key now includes exclusions (fixes a stale-cache collision).
3. UI — new CompanyFilterSection: searchable, count-annotated checklist; removable "hidden" chips (capped at 6 + "+N more"); scroll-shadow affordance; smooth height animation on open/close/row-wrap; memoised rows for performance. Rendered under Experience in the modal.
4. Config — gitignore *.env (the root frontend.env was previously unignored) and add frontend/.env.example.
5. Docs — PRPs/company-filter.md describing the design as shipped.

Test plan

• Open Filters → Companies lists companies with counts; counts respect other filters (e.g. Industry = Quant Trading).
• Uncheck a company → it disappears from results, total drops, other counts unchanged; a hidden chip appears.
• Chip ✕ / unchecking the last one animates closed smoothly; Clear empties exclusions without touching other filters.
• Reload preserves exclusions via URL; Reset Filters clears them.
• npm run build, npm run lint, npx tsc --noEmit all pass.

Notes

• Exclusion-only by design (no "hide all", no inclusion mode) and modal-only (not added to the mobile dropdown bar). Company logos and list virtualisation are out of scope for v1.

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[oliverhuangcode]

Lgtm

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Project	Deployment	Actions	Updated (UTC)
mploy-app	Ready	Preview, Comment	Jun 19, 2026 6:13am