fix frontend board mapping, game-over handling, and WASM-4

- fix Xform yx and add a shared view-aware board_position helper
- add GTK automatic game-over, restart, status, and multi-capture selection
- pin librsvg to the 2.60 series to match GTK4/glib 0.20
- add WASM orientation, undo/redo/new/flip controls, and winner overlay
- replace WASM crown images with canvas paths and remove dead files/deps
- make WASM-4 playable with mouse input, crowns, winner handling, and correct mapping
- move the WASM-4 release profile to the workspace root
- clean up frontend dead code and update the README

rdraught-wasm/Cargo.toml

@@ -8,22 +8,15 @@ repository.workspace = true
 rust-version.workspace = true
 version.workspace = true
 
-# [lib]
-# crate-type = ["cdylib"]
-
 [dependencies]
 rdraught.workspace = true
 rdraught-ui-common.workspace = true
 wasm-bindgen.workspace = true
 console_error_panic_hook.workspace = true
-rmath.workspace = true
-base64.workspace = true
-
 
 [dependencies.web-sys]
 workspace = true
 features = [
-  'DomMatrix',
   'CanvasRenderingContext2d',
   'CssStyleDeclaration',
   'Document',
@@ -31,9 +24,8 @@ features = [
   'EventTarget',
   'HtmlCanvasElement',
   'HtmlElement',
+  'KeyboardEvent',
   'MouseEvent',
   'Node',
-  'HtmlImageElement',
-  'SvgImageElement',
   'Window',
 ]