Sixth slice of the app.js split. Moves the favicon fetch/cache section
(faviconHost, saveEntryIcon, ensureEntryFavicon, backfillFavicons,
clearAllFavicons) to js/app.favicon.js. Pure declarations, no top-level
side effects → loads before app.js.
- Code moved byte-for-byte; no duplicate const; syntax OK on all 7 app parts.
- NEW: js/tests/favicon.test.js — 7 tests for faviconHost, the pure
URL→validated-hostname function that decides which domain is sent to the
DuckDuckGo proxy (a bug there leaks the wrong host). Covers scheme/www/
path/port stripping, non-hostname rejection, malformed dotting, unsafe
chars, and the 253-char DNS cap.
- Fixed an inaccurate source comment surfaced by the tests: it claimed raw
IPs "stay valid", but the TLD rule /\.[a-z]{2,}$/ rejects a numeric final
label, so IPs get no favicon lookup (fine). Test pins the real behaviour.
- Suite: 55 → 62 tests, all green. Assets regenerated (8 ordered JS files).
app.js: 11936 → 9790 lines (6 modules extracted).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
r-zakarya