Stabilize beta release with warning cleanup and edge-case fixes

SportsTimeTests/Domain/TripPollTests.swift

@@ -229,6 +229,24 @@ struct PollVoteTests {
         // Index 5 is ignored since it's >= tripCount
     }
 
+    @Test("calculateScores: ignores negative trip indices")
+    func calculateScores_negativeIndex() {
+        let scores = PollVote.calculateScores(rankings: [0, -1, 1], tripCount: 3)
+
+        #expect(scores[0] == 3)
+        #expect(scores[1] == 1)
+        #expect(scores[2] == 0)
+    }
+
+    @Test("calculateScores: ignores duplicate trip indices after first occurrence")
+    func calculateScores_duplicateIndices() {
+        let scores = PollVote.calculateScores(rankings: [1, 1, 0], tripCount: 3)
+
+        #expect(scores[1] == 3)
+        #expect(scores[0] == 1)
+        #expect(scores[2] == 0)
+    }
+
     @Test("calculateScores: empty rankings returns zeros")
     func calculateScores_emptyRankings() {
         let scores = PollVote.calculateScores(rankings: [], tripCount: 3)