Extend case for chat index and role (#577)

# PR Checklist
- [ ] Did you check if it works normally in all models? *ignore this
when it dosen't uses models*
- [ ] Did you check if it works normally in all of web, local and node
hosted versions? if it dosen't, did you blocked it in those versions?
- [ ] Did you added a type def?

# Description
With the recent increased utilization of custom styles, I've modified
the '{{chat_index}}' and '{{roll}}' cbs to cover a bit more cases.
Please review them to see if they meet your vision.


![image](https://github.com/user-attachments/assets/86ddb894-a497-4b60-b7b6-8c5040b276fb)

src/ts/parser.ts

@@ -926,6 +926,10 @@ function basicMatcher (p1:string,matcherArg:matcherArg,vars:{[key:string]:string
                 return db.subModel
             }
             case 'role': {
+                if (chatID !== -1) {
+                    const selchar = db.characters[get(selectedCharID)]
+                    return selchar.chats[selchar.chatPage].message[chatID].role;
+                }
                 return matcherArg.role ?? 'role'
             }
             case 'jbtoggled':{

src/ts/process/scripts.ts

@@ -197,7 +197,7 @@ export async function processScriptFull(char:character|groupChat|simpleCharacter
                 }
             }
             else{
-                data = risuChatParser(data.replace(reg, outScript))
+                data = risuChatParser(data.replace(reg, outScript), { chatID: chatID })
             }
         }
     }