[codex] Add practice notebook journal flow

[Talljack]

What changed

• Adds the /journal Practice Notebook flow with list/detail pages, manual creation, import dialog, editable entry rows, highlighting, and whole-notebook practice materialization.
• Broadens journal entries beyond fixed dialogue roles: speaker is now optional free text, so entries can be unlabeled phrases, A/B dialogue lines, Speak exports, or any custom label.
• Adds AI structure/OCR endpoints and shared normalization prompts for mixed English-learning material instead of teacher/me-only conversations.
• Adds Speak integration via SaveToJournalButton, including iOS native-host visibility and a guard that requires a real user message before saving.
• Wires journals into Dexie and Supabase sync with tombstone deletes, plus a migration for the remote table/RLS.

Why

The original notebook design assumed every saved item was a strict dialogue turn. Real learning material can be single phrases, unlabeled sentences, A/B scripts, lesson notes, or conversations exported from Speak. This PR makes the notebook model match those actual use cases while keeping Speak -> Save compatible.

Validation

• pnpm typecheck
• pnpm test src/lib/journal-structure.test.ts src/components/journal/save-to-journal-button.test.tsx src/stores/__tests__/journal-store.test.ts
• pnpm exec biome check src/lib/journal-structure.test.ts src/lib/journal-structure.ts src/components/journal/import-dialog.tsx src/components/journal/journal-detail.tsx src/components/journal/journal-list.tsx src/components/journal/turn-row.tsx src/stores/journal-store.ts src/types/journal.ts
• pnpm build

Browser QA

Verified with agent-browser against the local app:

• Created Useful Phrase Set from /journal via the real New dialog.
• Added real entries with no speaker, A, B, and Phrase labels.
• Confirmed /journal list shows Useful Phrase Set 4 entries and search matches the unlabeled line.
• Opened /speak, entered Ordering Coffee, sent a user message, confirmed Save becomes enabled, saved, and confirmed /journal shows Ordering Coffee 3 entries #speak.
• Tested Import flow with a browser network mock for /api/journal/structure: Analyze -> editable free-label preview -> Save notebook -> detail page.

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Project	Deployment	Actions	Updated (UTC)
echo-type	Ready	Preview, Comment	Jun 18, 2026 12:23pm