fix: clip metadata intervals to playable duration

Sources/App/MiruroMetadata.swift

@@ -4,8 +4,8 @@ import CoreFoundation
 struct MiruroInterval: Sendable, Equatable {
     enum Kind: Sendable { case intro, outro }
     let kind: Kind
-    let start: Double
-    let end: Double
+    var start: Double
+    var end: Double
     let episode: Int
     var rawKind: String = ""
     var provider: String? = nil
@@ -20,13 +20,16 @@ struct MiruroMetadata: Sendable {
     func visibleIntervals(episode: Int, duration: Double) -> [MiruroInterval] {
         guard duration.isFinite, duration > 0 else { return [] }
         var intro: MiruroInterval?, outro: MiruroInterval?
-        for row in intervals {
+        for var row in intervals {
             guard row.episode == episode, row.start.isFinite, row.end.isFinite,
-                  row.start >= 0, row.end > row.start, row.end <= duration,
+                  row.end > row.start,
                   !(row.provider?.range(of: "crunchyroll", options: .caseInsensitive) != nil),
                   (row.votes ?? 0).isFinite, (row.votes ?? 0) >= 0 else { continue }
             if let length = row.referenceLength, length.isFinite, length > 0,
                abs(length - duration) / duration > 0.05 { continue }
+            row.start = max(0, row.start)
+            row.end = min(duration, row.end)
+            guard row.end > row.start else { continue }
             // Strictly greater preserves input order on ties, equivalent to stable descending votes.
             switch row.kind {
             case .intro:

Sources/App/TerebiApp.swift

@@ -1614,8 +1614,10 @@ final class PlayerModel: ObservableObject {
         precondition(lifecycle.accept(metadata, identity: a, generation: first), "Current metadata is accepted")
         precondition(lifecycle.visibleIntervals(duration: 0).isEmpty, "Unknown duration hides bands")
         precondition(lifecycle.visibleIntervals(duration: 100).count == 2, "Actual duration permits exact-end bands")
-        precondition(lifecycle.visibleIntervals(duration: 95).count == 1, "Duration shrink revalidates raw bands")
-        precondition(lifecycle.visibleIntervals(duration: 100).count == 2, "Duration growth restores raw bands")
+        precondition(lifecycle.visibleIntervals(duration: 95) == [
+            metadata.intervals[0], MiruroInterval(kind: .outro, start: 90, end: 95, episode: 1)
+        ], "Duration shrink clips raw bands")
+        precondition(lifecycle.visibleIntervals(duration: 100) == metadata.intervals, "Duration growth restores raw bands")
         _ = lifecycle.replace(identity: b, episode: 2)
         precondition(lifecycle.metadata == nil, "Replacement clears title and intervals")
         precondition(!lifecycle.accept(metadata, identity: a, generation: first), "Different-identity result is stale")