InstinctaZero Android v0.8.3 — Easier position editing

v0.8.3 — Easier position editing

• Drag any piece to move it, even with a palette piece selected or Erase active.
• Tap an identical piece to remove it. Deselecting a palette piece selects Erase.
• Compact icon-led tools with short labels, and readable coordinates in both views.
• Reverse rotates the actual position 180° when it was entered from the wrong
  side. It keeps piece colours and side to move unchanged and supports Undo. The
  header Flip still changes only the view. After Reverse, check castling and
  en-passant in State; incompatible rights are cleared, and Undo restores them.

Open Board editor from Home or More → Board editor in analysis. Your saved
board/game remains separate. Existing PGNs, repertoires, pairing, navigation and
portrait behavior are unchanged. No PC restart or repertoire redownload is needed.

Verification: JavaScript model/controller tests, Android debug/release regressions,
release lint and signed APK checks. Touch previews at 360×640, 390×780 and 412×844
cover tool-independent drag, fast/occupied drops, cancelled and multitouch gestures,
tap toggles, coordinates, reverse/Undo, FEN/state, independent source-board storage
and restart. Checks are repeated against the signed APK's assets alongside existing
game, mainline/return and repertoire/Undo/transposition previews. The USB phone is
not used for testing.