Resolve moves into per-move cutscenes during battle execution

Each queued action now resolves to its move's cutscene
(cutscenes/battle/moves/<name>.jsonc), spliced into the executing state
with a BATTLE_POST_MOVE checkpoint after each one. Fighter turn order is
tracked via fighterOrder/fighterOrderCount, and resolved actions/pending
counts are cleared so fighters aren't skipped in later rounds. Also fixes
a BATTLE_WAIT_SELECTION deadlock and adds an optional "blocking" flag to
MODAL cutscene items.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

assets/cutscenes/battle/moves/slash.jsonc

@@ -1,9 +1,16 @@
 {
   "items": [
-      {
+    {
       "type": "MODAL",
-      "title": "BATTLE TEST",
-      "message": "BATTLE TEST"
+      "title": "Slash",
+      "message": "A quick blade strike cuts across the target."
+    },
+    {
+      "type": "WAIT",
+      "seconds": 2
+    },
+    {
+      "type": "MODAL_CLOSE"
     }
   ]
-}
+}