Fix several bugs ahead of 2.6.1v2.6.1

FileTreeView: when wrap is OFF, activate an explicit width constraint on
the code container derived from the widest line, giving the horizontal
scroll view a defined content size. Previously the constraint was
deactivated with nothing to replace it, making horizontal scrolling
unreliable. Also set horizontalScrollView.isScrollEnabled = !wrapLines
to prevent gesture conflicts when wrap is ON.

InboxView: remove the unnecessary loadThreads() network call fired after
markAllThreadsRead(). The threads array is already updated optimistically
and read state is persisted via InboxReadStateStore, so the refetch was
redundant and caused a brief loading flash.

HomeView: add scenePhase onChange handler to refresh dashboard data when
the app returns to the foreground, matching the existing pattern in
InboxView.

DiffView: wrap DiffBlockView content in a horizontal ScrollView so long
diff lines are readable. Switch inner VStack to LazyVStack for better
performance on large diffs.

SettingsView: replace direct UserDefaults access in behaviorSection with
@AppStorage, consistent with the rest of the app.

1 files changed, 6 insertions, 4 deletions

diff --git a/Hutch/Views/Repositories/DiffView.swift b/Hutch/Views/Repositories/DiffView.swift
index 4b8e512..a370dfb 100644
--- a/Hutch/Views/Repositories/DiffView.swift
+++ b/Hutch/Views/Repositories/DiffView.swift
@@ -76,13 +76,15 @@ private struct DiffBlockView: View {
     let lines: [String]
 
     var body: some View {
-        VStack(alignment: .leading, spacing: 0) {
-            ForEach(Array(lines.enumerated()), id: \.offset) { _, line in
-                DiffLineView(line: line)
+        ScrollView(.horizontal, showsIndicators: false) {
+            LazyVStack(alignment: .leading, spacing: 0) {
+                ForEach(Array(lines.enumerated()), id: \.offset) { _, line in
+                    DiffLineView(line: line)
+                }
             }
+            .frame(minWidth: 0, maxWidth: .infinity, alignment: .leading)
         }
         .font(.system(.caption, design: .monospaced))
-        .frame(maxWidth: .infinity, alignment: .leading)
         .background(Color(.secondarySystemBackground))
     }
 }