Add ticker symbol voting (e.g. QPL3++, TMP2--)

Extend vote detection to recognize game ticker symbols alongside the
existing thisgame++/-- syntax. Each symbol maps to a specific game so
users can vote for any game by its stock-style ticker. The matched
ticker is sent to the API via a new optional `ticker` field in the
vote request.

Made-with: Cursor

bridge/jackbox/votes.go

@@ -1,23 +1,42 @@
 package jackbox
 
-import "strings"
+import (
+	"regexp"
+	"strings"
+)
+
+// tickerVoteRe matches a ticker symbol (2-4 uppercase alphanumeric chars)
+// immediately followed by ++ or --.
+var tickerVoteRe = regexp.MustCompile(`(?i)\b([A-Z0-9]{2,4})(\+\+|--)`)
 
 // DetectVote checks if a message contains a vote and returns the vote type
-// Returns (true, "up") for thisgame++
-// Returns (true, "down") for thisgame--
-// Returns (false, "") for non-vote messages
-func DetectVote(text string) (isVote bool, voteType string) {
+// and optional ticker symbol.
+//
+// For "thisgame++" / "thisgame--": returns (true, "up"/"down", "")
+// For "QPL3++" / "tmp2--":        returns (true, "up"/"down", "QPL3"/"TMP2")
+// For non-vote messages:           returns (false, "", "")
+func DetectVote(text string) (isVote bool, voteType string, ticker string) {
 	lower := strings.ToLower(text)
-	
+
 	if strings.Contains(lower, "thisgame++") {
-		return true, "up"
+		return true, "up", ""
 	}
-	
+
 	if strings.Contains(lower, "thisgame--") {
-		return true, "down"
+		return true, "down", ""
 	}
-	
-	return false, ""
+
+	if m := tickerVoteRe.FindStringSubmatch(text); m != nil {
+		sym := strings.ToUpper(m[1])
+		if _, ok := LookupTicker(sym); ok {
+			if m[2] == "++" {
+				return true, "up", sym
+			}
+			return true, "down", sym
+		}
+	}
+
+	return false, "", ""
 }
 
 // IsRelayedMessage checks if a message is relayed from another chat