teach the snapshot verifier about decks

verify_snapshot still carried the stub from when both decks were always
absent, so the first battle that actually carried one was refused before
it reached the client. it reads them now: eight presence bits, then a
data reference, five vints and two booleans per filled slot.

while in there, the six battle booleans were all being discarded, which
hid the fact that the two score-change vints are only present when the
first of them is set. the verifier tracks it now, same as the encoder.

crates/logic/src/battle/verify.rs

@@ -1,6 +1,7 @@
 use titan::{ByteStreamReader, Result};
 use crate::battle::logic_game_mode::{SECTION_BATTLE, SECTION_TUTORIAL};
 use crate::data::{table, LogicDataRef, LogicDataTables};
+use crate::model::DECK_SLOT_COUNT;
 pub const BUFF_ARRAY_TABLE: i32 = table::DAMAGE_TYPES;
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct SnapshotReport {
@@ -37,6 +38,19 @@ impl<'a, 'b> Verifier<'a, 'b> {
         }
         Ok(Some((class_id, self.reader.read_vint()?)))
     }
+    fn spell_deck(&mut self) -> Result<()> {
+        let mut present = [false; DECK_SLOT_COUNT];
+        for slot in present.iter_mut() {
+            *slot = self.reader.read_boolean()?;
+        }
+        for _ in present.iter().filter(|slot| **slot) {
+            self.data_ref()?;
+            self.vints(5)?;
+            self.reader.read_boolean()?;
+            self.reader.read_boolean()?;
+        }
+        Ok(())
+    }
     fn vints(&mut self, count: usize) -> Result<()> {
         for _ in 0..count {
             self.reader.read_vint()?;
@@ -173,7 +187,8 @@ impl<'a, 'b> Verifier<'a, 'b> {
         self.vints(2)?;
         self.vints(8)?;
         self.vints(3)?;
-        for _ in 0..6 {
+        let battle_ended_called = self.reader.read_boolean()?;
+        for _ in 0..5 {
             self.reader.read_boolean()?;
         }
         self.mark("objects");
@@ -224,7 +239,7 @@ impl<'a, 'b> Verifier<'a, 'b> {
         self.mark("decks");
         for _ in 0..2 {
             if self.reader.read_boolean()? {
-                return Err(titan::Error::Unsupported("decks are not expected yet"));
+                self.spell_deck()?;
             }
         }
         self.mark("leaders");
@@ -237,6 +252,9 @@ impl<'a, 'b> Verifier<'a, 'b> {
             }
         }
         self.mark("battle_tail");
+        if battle_ended_called {
+            self.vints(2)?;
+        }
         self.vints(6)?;
         self.mark("avatars");
         for _ in 0..2 {