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.

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