feat(clients): tiered stats overlay everywhere — Compact/Normal/Detailed on every platform

Ship the Android client's 3-tier stats-overlay semantics in every other client
(design/stats-unification.md vocabulary): Off → Compact (one line: fps · e2e ms ·
Mb/s + loss flag) → Normal (mode + e2e p50/p95 + loss counters) → Detailed
(decoder path, HDR tag, per-stage latency equation).

Apple: new StatsVerbosity in PunktfunkKit persisted under punktfunk.statsVerbosity
(migrates the legacy hudEnabled bool: explicit off → Off, else Normal). The
existing three-finger tap (TouchMouse, trackpad/pointer modes only — touch
passthrough untouched) now cycles the tiers instead of toggling, matching
Android; ⌃⌥⇧S (menu + captured-state monitor) cycles the same ladder. Tiered
StreamHUDView (compact glass pill / headline HUD / full equation HUD); the iOS
corner disconnect also shows in Compact (the pill carries no button). Tier
pickers on iOS, macOS, tvOS and the gamepad settings UI.

Session stack (Linux + Windows + Deck share punktfunk-session): shared
pf_client_core::trust::StatsVerbosity; Settings grows stats_verbosity with a
show_stats fallback, and writes keep the legacy bool in sync so pre-tier
binaries reading the same JSON agree on off vs on. Ctrl+Alt+Shift+S cycles the
tier and re-renders the OSD immediately from the last stats window; the stdout
stats: line always carries the full Detailed text so the shell status card and
scripts keep a stable shape; --stats bumps Off → Normal without demoting a
richer tier. Tier pickers in the GTK dialog, the WinUI settings page and the
console-UI settings row; shortcut copy updated (GTK shortcuts window, Windows
help, session README). The Windows legacy builtin path keeps its bool HUD.

Tests: tier migration/round-trip in trust.rs, tiered stats_text output in
pf-presenter.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

clients/apple/Sources/PunktfunkClient/Settings/SettingsView.swift

@@ -38,7 +38,9 @@ struct SettingsView: View {
     @AppStorage(DefaultsKey.micEnabled) var micEnabled = true
     @AppStorage(DefaultsKey.audioChannels) var audioChannels = 2
     @AppStorage(DefaultsKey.codec) var codec = "auto"
-    @AppStorage(DefaultsKey.hudEnabled) var hudEnabled = true
+    // The overlay tier's raw string (the pickers tag by rawValue); the absent-key default runs
+    // the legacy-hudEnabled migration (same pattern as ContentView/StreamCommands).
+    @AppStorage(DefaultsKey.statsVerbosity) var statsVerbosityRaw = StatsVerbosity.current.rawValue
     @AppStorage(DefaultsKey.hudPlacement) var hudPlacement = HUDPlacement.topTrailing.rawValue
     @ObservedObject var gamepads = GamepadManager.shared
     #if !os(tvOS)
@@ -294,10 +296,6 @@ struct SettingsView: View {
             })
     }
 
-    private var hudEnabledTag: Binding<String> {
-        Binding(get: { hudEnabled ? "on" : "off" }, set: { hudEnabled = $0 == "on" })
-    }
-
     private var hdrEnabledTag: Binding<String> {
         Binding(get: { hdrEnabled ? "on" : "off" }, set: { hdrEnabled = $0 == "on" })
     }
@@ -352,7 +350,7 @@ struct SettingsView: View {
                     .padding(.top, 8)
                 TVSelectionRow(
                     title: "Statistics overlay",
-                    options: [("On", "on"), ("Off", "off")], selection: hudEnabledTag)
+                    options: SettingsOptions.statsVerbosities, selection: $statsVerbosityRaw)
                 TVSelectionRow(
                     title: "Statistics position", options: SettingsOptions.hudPlacements,
                     selection: $hudPlacement)