Follow-up to #4637. serve_index — the handler for / and the SPA deep-link routes (/notes, /calendar, /cookbook, /email, /memory, /gallery, /tasks, /library) — pre-checked os.path.exists and raised its own HTTPException(404, "index.html not found") when the bundle was missing. So a missing core template returned 404 before serve_html_with_nonce's 500 could fire, the one inconsistency left after #4637. index.html is a fixed, app-bundled template; a missing one is a broken deployment (server fault), not a client "not found", so it should surface as a logged 500 in 5xx alerting rather than a 404. Keep the static->root fallback, drop the redundant existence guard and the dead-end 404, and let the shared helper handle the missing case. Verified against the running app: / and /notes return 200 with the bundle present and a logged 500 when index.html is absent. Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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