1.3.0.35-dev4-cpr-vcodex-steroids

This release delivers a full graphic restyle of the UI, a large set of new
vector icons, reader-menu icons, plus several bug fixes — most importantly a
PNG-decoding fix that prevented folder-selector image previews from rendering.

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Highlights

• 🎨 Complete UI graphic restyle with a new "cyberpunk" panel style (Marcoand75 theme)
• 🖼️ 19 new SVG icons generated into 38 C++ header files (32 px + 24 px variants)
• 📖 Reader menu now shows per-item icons
• 🐛 PNG image previews in the screensaver / sleep folder selectors no longer fail
  with "Invalid image file"
• 🔧 Various stability and UI fixes

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🎨 UI / Graphic Restyle

• New angular "cyberpunk" panel style (chamfered borders, corner brackets, scanline
  separators) for the Marcoand75 theme, applied across homepage stats, icon bar,
  carousel and popup overlays.
• Centralized panel drawing into a shared PanelDrawHelper helper
  (drawCyberpunkPanel, drawBackground, drawAngularPanel, drawRowIcon, …)
  used by popups, context menus and overlays.
• Restyle of homepage panels and the book-context popup with the cyberpunk style.
• All Lyra / Marcoand75 theme panels reworked for consistent layout and metrics.
• Settings screens restored/refreshed as part of the restyle.

🖼️ Icons

• Added 19 new custom SVG icons, each emitted as both 32 px and 24 px C++ headers
  (38 new components/icons/*.h files): SearchPlus, SearchMinus, TimeFast,
  SortAsc, SortDesc, LibraryNew, GpsFound, MedalAlt, Dictionary2, AppsHub,
  CalendarTime, LibraryBook, DeleteFile, CacheCleaner, FinishFlag,
  NotificationUnread, FileTransfer, Calibre, plus Bookmark/Search/Rotation/Pageview.
• New icon-generation tooling:
  • scripts/generate_cpr_icons.py — converts SVGs into the C++ header format.
  • scripts/fetch_koreader_icons.py — fetches upstream KOReader icon sources.
• Reader menu (EpubReaderMenuActivity) now renders an icon per menu item
  (Settings, Chapter, Bookmarks, Dictionary, Rotate, Auto-turn, Screenshot, QR,
  Mark finished, Sync, Delete cache, …).

🐛 Bug Fixes

• PNG folder-selector previews (ScreenSaverPreviewActivity): PNG decoding
  failed with "Invalid image file" while BMP previews kept working. Root cause:
  PNGdec keeps its entire ~58 KB working set (32 KB zlib window + inflate state +
  row/palette/file buffers) inline in the PNG object, so new PNG() needed one
  large contiguous heap block that is frequently unavailable on the ESP32-C3 due
  to heap fragmentation. The decoder now uses a single static instance living in
  .bss, so decoding no longer depends on contiguous heap. Font caches are also
  cleared right before each decode (mirroring SleepActivity). BMP path unaffected.
• Long refresh after exiting the Library fixed.
• Mark as Unread now correctly resets the book "completed" status
  (ReadingStatsStore::beginSession).

🔧 Improvements

• Homepage panel label changed from "Tempo" to "ETA" (estimated time to finish),
  already present in IT/EN translations.
• Minor GfxRenderer additions to support the new panel drawing.

🌐 Translations

• English and Italian string tables updated for the new labels/icons.

🛠️ Internal / Developer

• src/components/PanelDrawHelper.h added as the shared panel-drawing utility.
• src/util/PngSleepRenderer.cpp reworked to reuse a static PNG decoder instance
  (safe: PNG::open() re-initializes the struct on every call, and decoding is
  always synchronous from a single activity).
• README.md updated with the full feature list.
• ShortcutRegistry.h extended with the new shortcut icons.

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Affected areas (by file count)

Area	Files
Icons	82
Other	23
Activities	7
Themes	5
Core / PNG	4
Scripts	3
Translations	2

Build note: the static PNG decoder working set raises static RAM usage
(~31% → ~49% of DRAM); this is intentional to guarantee PNG decoding without
relying on fragmented heap.