puzzles: resync with Simon's upstream e00cb46 from 25 Sep 2025.

Notably, this enables "Group".

This also includes some changes to the Rockbox frontend:

- Removes extraneous underline from Extensive Help text.

- Implements a workaround for an upstream breaking change that removes
  the BLITTER_FROMSAVED flag. We depend on this for mouse mode. This
  is apparently the only place this flag was ever used. Note that I've
  hardcoded an arbitrary negative value for BLITTER_FROMSAVED instead
  of -1, for the reason Ben Harris mentioned in his commit removing it
  from the upstream source tree.

- Adds an implicit clip() to the game region when drawing a
  puzzle. This fixes a bug in Untangle where dragging a point off
  screen leads to ugly lines outside the play area.

- Implements "Quick Help" for unfinished plugins (but not "Extensive
  Help").

- Documents the need to disable unfinished plugins in resync.sh (weak
  symbols on win32).

Change-Id: Ic318a5db4b15acb437a3f951fbc9b7919c6fa652

apps/plugins/puzzles/SOURCES

@@ -1,17 +1,28 @@
-/* Auto-generated by resync.sh */
+/* !!! DO NOT MODIFY THIS FILE !!! */
+
+/*
+ *
+ * This file is automatically generated by resync.sh. Any manual
+ * changes here will be overwritten by future resyncs.
+ *
+ * If you wish to change anything in this file, instead edit resync.sh
+ * to accomplish what you want. You have been warned.
+ */
+
+/* !!! DO NOT MODIFY THIS FILE !!! */
+
+/* rockbox frontend sources, from SOURCES.rockbox */
 rockbox.c
 rbwrappers.c
 rbmalloc.c
 lz4tiny.c
-#ifndef WIN32
 dummy/nullhelp.c
-#endif
 
-/* puzzles core sources */
+/* puzzles core sources, from src/CMakeLists.txt */
 src/combi.c
 src/divvy.c
-src/draw-poly.c
 src/drawing.c
+src/draw-poly.c
 src/dsf.c
 src/findloop.c
 src/grid.c
@@ -22,8 +33,8 @@ src/loopgen.c
 src/matching.c
 src/midend.c
 src/misc.c
-src/penrose-legacy.c
 src/penrose.c
+src/penrose-legacy.c
 src/random.c
 src/sort.c
 src/spectre.c