Release 1.8.0: offline reading, automatic sync, and account improvements

[Muawiya-contact]

Release version 1.8.0 from develop to main. This release adds reliable offline reading and synchronization, improves large saved collections and startup, adds password visibility, and includes the three branded account-email templates.

Migration 0010_generation_daily_usage.sql is applied to production and verified through a separate read-only connection, including its columns, default, constraints, and RLS. The ledger update is merged through #193, and the required Migrations applied check passes.

What's new:

• Read downloaded saved lessons and examples offline; reconnect or reopen to sync likes, saves, completion, and topic choices (feat: complete offline reading and foreground sync (#133) #183).
• Load bounded startup state while retaining lifetime progress totals, and search/filter older saved lessons through paginated collection loading (perf: bound startup history and saved metadata (#150) #185).
• Show or hide a password during sign-in and signup (fix: add password visibility and verify saved offline reading (#182) #189).
• Clearer signup confirmation, password recovery, and password-change emails with One Concept branding and the Coding Moves organization link (feat: add branded Supabase account email templates #188).
• A version-matched one-time What's New card with six highlights, scrollable on small screens and dismissed once per version on each device.

Backend improvements:

• Keep API database connections warm with bounded probes and cleanup (Keep API database connections warm after idle periods #184).
• Share the persisted daily generation budget across refill, prefetch, and catalog rewrites (fix: enforce one daily Gemini budget across generation paths (#151) #186).

Validation:

• 145 backend tests passed, no skips, against disposable PostgreSQL 16.
• 33 Node 24 mobile regression tests and TypeScript passed.
• Android and web production exports passed.
• Card layout passed six size/theme combinations; dismissal survived offline restart.
• Password and 365-saved-lesson offline browser acceptance passed during fix: add password visibility and verify saved offline reading (#182) #189; these flows are unchanged in release preparation.

Release checklist:

• App version 1.8.0; native runtime remains 1.3.0.
• Nonempty matching What's New entry and persistent dismissal verified.
• Production migration 0010 applied and verified; ledger updated afterward (Fix release migration check after verified production application #193).
• Required Migrations applied check passes.
• At deployment, use consistent generation caps and pause old generators; enable at the next Pacific reset or conservatively seed today's usage while paused (backend/README.md).

No new APK is required for this JavaScript-only mobile release. Merge triggers production/preview OTA and backend deployment. Draft #187's SMTP-provider setup is excluded. The owner reports installing the email templates in Supabase; actual inbox delivery and physical-device checks remain unverified.