enhance: rename and clean up pool responses page

[guangshinhaha]

Pool Responses — /[slug]/dashboard/pool-responses

Rename and update copy on the pool responses page. The dispatch engine (Phases 6-7 matching + notification + acceptance) has been shelved, so this page needs to reflect the current simpler flow.

Changes

• Rename page — "Pool Responses" is unclear to school users. Options to consider:
  • "External Relief Teachers" (simple, descriptive)
  • "Relief Educator Requests" (MOE-aligned terminology)
  • "External Relief Management"
  • Pick whichever is clearest for KPs
• Update page description / copywriting — current copy references "offers broadcast to the relief pool" and confirm/withdraw flows that may no longer apply since the dispatch engine was shelved. Review what the page currently does and rewrite copy to match actual functionality
• Clarify SRE vs FAJT/CAJT — if the page is specifically for Short-term Relief Educators (daily hire), make that explicit. FAJT/CAJT are contract-based and managed differently. Reference: https://www.moe.gov.sg/careers/adjunct-and-relief-schemes

Open question

• With the dispatch engine shelved, what does this page actually do now? Is it just a view of preferred/REMS pool teachers? If so, consider whether it should be merged with /[slug]/dashboard/preferred-pool or /[slug]/dashboard/rems-pool

Context

• Pool responses page: src/app/[slug]/dashboard/pool-responses/
• Preferred pool: src/app/[slug]/dashboard/preferred-pool/
• REMS pool: src/app/[slug]/dashboard/rems-pool/

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