feat(source2): lock dark mode, sans-serif typography, and all recent updates

docs/log/2026-07-23-0910-explain-fetch-errors.md

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+# Log: Clarified Network Fetch Errors During Compilation
+
+**Trigger**: User reported TypeError: Failed to fetch during dev server hot-reload
+**Date**: 2026-07-23 09:10 WIB
+
+## Analysis
+
+The client-side TypeError: Failed to fetch errors happen because Next.js compilation momentarily blocks or restarts the local API routing listener on port 3000 when file changes are saved. The browser's automatic polling/auto-refresh timers triggered exactly during this transition window, resulting in failed fetch requests.
+
+## Status
+
+Once the compilation completes successfully (Compiled in 162ms), the server routes are fully active. Refreshing the browser resolves the fetch errors instantly.