feat: Add unlisted transcript review page for participants

[ufkhan97]

Summary

Adds the ability for session hosts to share a secure, unauthenticated link with participants so they can view their own session transcript without creating an account.

Can extend into auto-emailing all participants a link to read their transcript. Depends on how Harmonica sends emails.

How it works from this PR:

1. Host opens a participant's conversation modal
2. Clicks the new Share button (next to close button)
3. Link is copied to clipboard
4. Host pastes link in email/message to participant
5. Participant opens link → sees only their own transcript

Changes

• Migration: 032_add_transcript_share_tokens.ts - new table for share tokens
• Schema: Added TranscriptShareTokensTable type
• Server Action: share-transcript.ts - generates tokens, sends emails
• Page: /transcript/[token] - public transcript view
• UI: Share button in ParticipantSessionRow modal header

Before Merging

⚠️ Migration blocked by pre-existing issue

Run this SQL directly in the database:

  CREATE TABLE transcript_share_tokens (                                                                                                                                   
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),                                                                                                                         
    token VARCHAR(21) NOT NULL UNIQUE,                                                                                                                                     
    user_session_id UUID NOT NULL REFERENCES user_sessions(id) ON DELETE CASCADE                                                                                           
  );                                                                                                                                                                       
                                                                                                                                                                           
  CREATE INDEX idx_transcript_share_tokens_token ON transcript_share_tokens(token);     

Testing

After migration is applied:

1. Go to a session with participants
2. Click on a participant row to open conversation modal
3. Click the Share icon (next to X)
4. Open link in incognito window
5. Verify: shows only that participant's messages, no login required

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Project	Deployment	Review	Updated (UTC)
harmonica-web-app	Ready	Preview, Comment	Dec 19, 2025 1:52am
harmonica-web-app-dev	Ready	Preview, Comment	Dec 19, 2025 1:52am