Revert "chore: reduce coach prompt trigger threshold from 10 to 5 messages"

chore: reduce coach prompt trigger threshold from 10 to 5 messages

feat: add early username availability check on registration step 1

feat: add "無任職" position option to registration form

change the wording "SEL Chat Coach" to "師生對話練習室"

validate username when registration

support additional teacher registration information

feat: add help icon buttons with info modals on dashboard

feat: defer coach selection to ad prompt with two-step UI

revise evaluation to be generic

support reset evaluation prompt

support updating evaluation prompt in UI

refine evaluation and fix CSV download problem

support evaluating coach direct prompt

support conversation evaluation

support admin login page

support admin login page

feat: remove the usage of coach summary

refactor: extract coach modal animation into reusable components

feat: improve coach modal open/close animation symmetry

feat: modify coach modal style and animation

feat: Move ask coach button from header to message input area

Change the coach conversation trigger from 15 messages to 10 messages

fix: resolve 404 error when branching from new messages

Merge branch 'fix-retry-fail-remove-autocomplete'

fix: turn of autoComplete and fix rtey failed

Change the coach conversation trigger from 6 messages to 15 messages

fix: build failed

feat: add branch converstion feature

add error handling to prevent stuck

make conversation query more friendly

prevent conversation N+1 query

prevent conversation N+1 query

prevent conversation N+1 query

tune performance

fix: Prevent Supabase connection pool exhaustion in health endpoint

fix: Correct sessions table column mapping in health endpoint

fix: Improve Supabase connection handling and fix health endpoint schema errors

feat: Add production deployment support with Supabase and Docker

fix: Fix speaker auto-detection race condition on conversation reload

fix download conversation problem

fix admin conversation UI problem

fix: Improve shrink animation precision for mobile

feat: Add shrink animation when closing coach ad prompt modal

feat: Hide 'Ask Coach' button when speaker is coach

feat: Add speaker auto-detection on conversation page load

refactor: Update tests and admin UI to use new prompt system

Merge remote-tracking branch 'origin/main' into ui-update

feat: Change coach ad prompt threshold from 15 to 6 messages and hide UI elements

fix: Use database-backed PromptService in /api/personalities endpoint