docs: document offlineacademy v2 improvements

2026-07-26 11:58:44 +00:00 · 2026-07-22 05:26:17 +08:00
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+# OfflineAcademy v2
+
+The `dev/offlineacademy-v2` branch focuses on making the existing product feel faster and more deliberate without changing its local-first mission.
+
+## Performance work
+
+- The course API now runs independent database reads in parallel.
+- Lesson totals are collected through module relation counts instead of a separate lesson grouping plus module lookup.
+- Partial course progress is calculated from completed lesson records, fixing the previous 0-or-100 dashboard behavior.
+- Course thumbnails prefer the database value and only fall back to filesystem discovery when needed.
+- API responses expose `Server-Timing` metrics for database, enrichment, and total request time.
+- The course hook cancels obsolete requests, rejects stale responses, caches recent pages briefly, and prefetches the next page.
+- The splash screen renders over already-loaded content, appears once per browser session, and has a much shorter minimum duration.
+- Course cards use CSS content visibility to reduce rendering work below the viewport.
+
+## Premium dark interface
+
+The v2 visual layer is intentionally scoped to dark mode. Light mode keeps the established appearance.
+
+- Deep ink background with restrained emerald and warm amber accents.
+- Higher-contrast text and quieter secondary labels.
+- More substantial cards with subtle elevation instead of heavy neon glow.
+- Cleaner controls, inputs, popovers, progress bars, and navigation surfaces.
+- Touch-friendly course actions and reduced-motion support.
+- Theme bootstrapping before hydration to prevent the light-to-dark flash.
+
+## Product boundary
+
+OfflineAcademy remains a single-user, self-hosted, LAN-first course library. This branch does not add accounts, cloud dependencies, subscriptions, or unrelated workflows.