https://claude.ai/code/session_0187FXrbScDSWfbNEk9SfJaj

https://claude.ai/code/session_0187FXrbScDSWfbNEk9SfJaj

The new theme CSS files introduced several patterns that cause
scroll jank and memory pressure, especially on mobile:

- terminal.css: Full-viewport fixed pseudo-element with repeating
  gradient scanlines forced GPU compositing on every scroll frame.
  Now limited to desktop only with will-change layer promotion.
- codex.css/sakura.css: text-rendering: optimizeLegibility on body
  triggered expensive kerning/ligature computation on all text.
- codex.css: font-feature-settings forced text shaper on every glyph.
- codex.css: hyphens: auto required dictionary lookups during layout.
- style.css: transition: all on buttons and sidebar links caused
  unnecessary animation work during scroll hover state changes.
- main.ts: checkReadItems did O(n) individual querySelector calls
  per scroll tick; switched to single querySelectorAll batch query.
- Polling interval reduced from 1s to 3s (scroll handler already
  covers the normal case, polling is just a robustness fallback).

https://claude.ai/code/session_0187FXrbScDSWfbNEk9SfJaj

Improve image proxy security, caching, and error handling

Rewrites the image proxy handler to address several issues:

- Stream responses with io.Copy instead of buffering entire image in memory
- Add 25MB size limit via io.LimitReader to prevent memory exhaustion
- Close resp.Body (was previously leaked on every request)
- Validate Content-Type is an image, rejecting HTML/JS/etc
- Forward Content-Type and Content-Length from upstream
- Use http.NewRequestWithContext to propagate client cancellation
- Check upstream status codes, returning 502 for non-2xx
- Fix ETag: use proper quoted format, remove bogus Etag request header check
- Increase timeout from 5s to 30s for slow image servers
- Use proper HTTP status codes (400 for bad input, 502 for upstream errors)
- Add Cache-Control max-age directive alongside Expires header

Tests: comprehensive coverage for Content-Type filtering, upstream errors,
streaming, ETag validation, User-Agent forwarding, and Content-Length.
Benchmarks: cache hit path and streaming at 1KB/64KB/1MB/5MB sizes.

https://claude.ai/code/session_01CZcDDVmF6wNs2YjdhvCppy