Merge updates

merge0.1

Merge branch 'Snd-R:main' into main

Preview0.1

This release adds Smart speech balloon reading with Seeneva‑style behavior and improves Continuous mode.

• Smart mode detects speech balloons (YOLOv4‑tiny) and navigates them before turning pages.
• Zoomed balloon overlay uses proportional scaling and is positioned on the page (not centered).
• Paged reader: left/right taps navigate balloons; long‑press a balloon to open it directly.
• Continuous reader: Smart mode indexes the current comic once, reuses the index on next open, and now refreshes the
  current + next page in the background to catch missed balloons while you read.
• Continuous Smart navigation follows balloons with smoother scrolling and increased zoom (+10%).
• Smart is still limited to Screen Fit; Panels and other scale modes are not wired yet.
• Continuous detection can still miss some balloons depending on page layout.

Notes

• For long‑press selection, keep the target balloon around mid‑screen (or slightly above) to avoid gesture conflicts.
• Initial indexing may take a short moment on large chapters.

Preview Smart Ballons Reader implemented

Basic release

This build is a minimal preview. Balloon navigation is supported only in Paged mode with Screen Fit; other reader modes are not supported yet.