trilwu/crosspet v1.8.4 on GitHub

Critical Stability Fixes

Fix system crash on Home (xTaskPriorityDisinherit assert) — recent-covers loader was unconditionally allocating EPUBs for every shelf entry, fragmenting the heap and corrupting FreeRTOS mutex storage. Now skips EPUB load when the cover thumbnail is already cached.
Fix missing cover image when external font is enabled — JPEG decoder was starved of the ~33 KB free heap it needs while a CJK font (~34 KB) occupied RAM. Fonts are now temporarily unloaded around cover generation, then reloaded.
Fix sleep-screen ghosting — the cached cover render now does a HALF_REFRESH wipe before drawing, so prior screen content is fully cleared.
Fix sleep-screen blank/white panel after KOReader sync — bumped the post-render settle delay (100 → 250 ms) so the SSD1677 charge pump doesn't cut power before the panel's waveform finishes settling.
Fix freeze on cafe Wi-Fi (captive portals) — KOReader sync now probes cp.cloudflare.com/generate_204 (HTTP, 4 s timeout) before NTP/TLS. Without this, captive portals caused ~45 s of mbedTLS retries that looked like a hang.
Fix BLE heap exhaustion when opening a book or settings while Bluetooth is on.
Fix two small memory leaks.
Fix BMPViewer ghosting on exit.
Fix boot-loop on opening large XTC files.
Fix wild-pointer crash in JPEGDEC MCU_SKIP handling.
Fix wild reader bugs (Reddit reports): stray apostrophes, wake-up rendering, clock display, cover recovery, and 6 more reader bugs reported on Reddit.

Beta toggle: apply custom SD-card font to UI text (in addition to reader text).
OPDS multi-server support — manage multiple OPDS catalogs.
OPDS search + next/prev page navigation in browser.
Show full path bar in the file browser.
Display file extensions in the file browser.
Show crash reason on boot for easier diagnosis.
Manual screen refresh via short power-button press.
Smooth battery percentage on X4.
Show long branch names in OTA branch picker.
Slovenian translation.
Initial X3 hardware support (grayscale antialiasing, sleep screen sizing, RTC notes).

Replaced picojpeg with JPEGDEC for cover-art conversion (faster, lower RAM).
External-font path: WDT feeds during SD reads, forced supplement mode for UI fonts.
Flashcard: support large decks, text wrapping, fixed SdFat handle leak.
drawArc / fillArc rewritten for faster execution.
Web-server /delete API: backward compatibility restored.
Footnote link text correctly rendered; footnotes consider orientation for gutters.
Combining-mark glyph positioning uses font metrics.
Hyphenation: ISO 639-2 language codes now supported.
Bookerly font replaced with Noto Serif for licensing reasons.
Reverted notosans_12 UI font to tabular numerals.