CSS: reduce backdrop-filter to modals only, add contain/content-visibility
for inactive tabs, optimize transitions to background-color, pre-compute
color-mix results, add container queries, split themes to lazy-loaded file.
JS: cache DOM refs in render path, add field-level diffing for SSE updates,
replace innerHTML with replaceChildren() in hot paths, add WebGL colour
cache invalidation on theme switch.
HTML: add defer to scripts, lazy-load plugin scripts on tab activation,
SVG sprite sheet for tab icons, template elements for deferred tab content,
improve aria-live/keyboard nav/colour contrast accessibility.
Server: upgrade Cache-Control to immutable, add Brotli compression alongside
gzip with Accept-Encoding negotiation.
Implements all items from docs/frontend_improvements.md except app.js ES
module split (P1, requires major refactor) and Web Worker migration (P3).
https://claude.ai/code/session_015rQNMGvusj5jY66MPUgYqt
Signed-off-by: Claude <noreply@anthropic.com>
Claude