[SEARCH] Port Typesense search to student-facing StudentHub app

[BAWES]

Context

The meilisearch branch on the studenthub (student-facing) repo had a parallel Meilisearch implementation. The last commit on that branch was 1554f3d — "Fix initial facet filters" (Nov 13 2025), also indicating the same facet count problem we hit on the staff app.

Once #41 and #42 are merged on the staff app, the same TypesenseService pattern should be ported to the student app so both share the same backend search infrastructure.

Depends on: #40 (backend endpoints, same /search/key and /search/search endpoints serve both apps)

Scope

1. Port TypesenseService

Copy src/app/services/typesense.service.ts from studenthub-staff (post #41 merge) into studenthub student app. The service is identical — same backend endpoints.

2. Student Search Context Differences

The student app search is job/opportunity search, not candidate search. The facets will differ:

Facet	Attribute
Job Type	job_type
Work Type	work_type (full-time, part-time, internship)
Location	location.country_id
Industry	industry_id
Company	company_id
Salary Range	salary_min, salary_max (range filter, not facet)
Has Deadline	has_deadline

Create a JobSearchService mirroring CandidateSearchService with job-specific facets and collection name from environment.

3. Geo Filter

The studenthub meilisearch branch added geo filter in commit eb6849dd — "New meilisearch geo filter". Port this to Typesense geo search syntax:

// Meilisearch geo filter
`_geoRadius(${lat}, ${lng}, ${radiusMeters})`

// Typesense equivalent  
filter_by: `location.coordinates:(${lat}, ${lng}, ${radiusKm} km)`
sort_by: `location.coordinates(${lat}, ${lng}):asc`

4. Update environment files

// environment.ts
typesenseJobCollection: 'jobs'
typesenseCandidateCollection: 'candidates' // if student app also searches candidates

5. Remove Meilisearch references

• Delete MeilisearchService from student app
• Remove meilisearch from package.json if it was added
• Clean up any environment.meilisearch* keys

Acceptance Criteria

• TypesenseService in student app points to same /search/key and /search/search backend endpoints as staff app
• JobSearchService created with job-specific facets
• Job search page returns results via Typesense
• Facet counts work correctly (all values visible regardless of active filters)
• Geo filter ported to Typesense syntax
• Meilisearch service and references fully removed
• No TypeScript errors

Branch

Branch from master of studenthub repo. Name: feature/typesense-service

Note on Repository

This issue is tracked on studenthub-staff for cross-reference but the actual work is in the studenthub repo. Create a parallel issue there once #41 and #42 are complete and the pattern is validated.