Resolved path was not checked against the static/ directory, allowing
GET /static/../../../../etc/passwd to serve arbitrary files.
Fix: resolve the path and call relative_to(static_root) before serving.
Returns 404 for any path that escapes the static/ directory.
fix(css): add !important to three dead mobile overrides in @media(640px)
Three @media(max-width:640px) rules added by the mobile responsive PR
were silently overridden by later bare rules in the same stylesheet:
.composer-wrap padding (overridden by line 347)
.suggestion-grid max-width (overridden by line 364)
.tool-card margin-left (overridden by line 460)
Fix: add !important to these three declarations so the mobile overrides
actually fire on narrow screens.
Tests: 224 passed, 0 failed.
0875dddbff