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/linux/src/app.rs

@@ -670,7 +670,7 @@ pub fn shortcuts_window(parent: &adw::ApplicationWindow) -> gtk::ShortcutsWindow
             </child>
             <child>
               <object class="GtkShortcutsShortcut">
-                <property name="title">Toggle statistics overlay</property>
+                <property name="title">Cycle the statistics overlay (off · compact · normal · detailed)</property>
                 <property name="accelerator">&lt;Control&gt;&lt;Alt&gt;&lt;Shift&gt;s</property>
               </object>
             </child>

clients/linux/src/ui_settings.rs

@@ -3,6 +3,7 @@
 
 use crate::trust::Settings;
 use adw::prelude::*;
+use pf_client_core::trust::StatsVerbosity;
 use std::cell::{Cell, RefCell};
 use std::rc::Rc;
 
@@ -324,10 +325,13 @@ pub fn show(
             "Software",
         ],
     );
-    let stats_row = adw::SwitchRow::builder()
-        .title("Show statistics overlay")
-        .subtitle("fps · bitrate · latency on the stream — Ctrl+Alt+Shift+S toggles live")
-        .build();
+    let stats_row = ChoiceRow::new(
+        &dialog,
+        inline,
+        "Statistics overlay",
+        "Compact = fps · latency · bitrate in one line — Ctrl+Alt+Shift+S cycles the tiers live",
+        &["Off", "Compact", "Normal", "Detailed"],
+    );
     let fullscreen_row = adw::SwitchRow::builder()
         .title("Start streams in fullscreen")
         .subtitle("F11, the mouse at the top edge, or L1+R1+Start+Select lead back out")
@@ -338,7 +342,7 @@ pub fn show(
     stream.add(compositor_row.widget());
     stream.add(decoder_row.widget());
     stream.add(&fullscreen_row);
-    stream.add(&stats_row);
+    stream.add(stats_row.widget());
 
     let input = adw::PreferencesGroup::builder().title("Input").build();
     // Which physical controller forwards as pad 0: automatic = the most recently connected
@@ -483,7 +487,11 @@ pub fn show(
         compositor_row.set_selected(comp_i as u32);
         let dec_i = DECODERS.iter().position(|&d| d == s.decoder).unwrap_or(0);
         decoder_row.set_selected(dec_i as u32);
-        stats_row.set_active(s.show_stats);
+        let stats_i = StatsVerbosity::ALL
+            .iter()
+            .position(|v| *v == s.stats_verbosity())
+            .unwrap_or(0);
+        stats_row.set_selected(stats_i as u32);
         fullscreen_row.set_active(s.fullscreen_on_stream);
         inhibit_row.set_active(s.inhibit_shortcuts);
         mic_row.set_active(s.mic_enabled);
@@ -509,7 +517,9 @@ pub fn show(
         s.compositor = COMPOSITORS[(compositor_row.selected() as usize).min(COMPOSITORS.len() - 1)]
             .to_string();
         s.decoder = DECODERS[(decoder_row.selected() as usize).min(DECODERS.len() - 1)].to_string();
-        s.show_stats = stats_row.is_active();
+        s.set_stats_verbosity(
+            StatsVerbosity::ALL[(stats_row.selected() as usize).min(StatsVerbosity::ALL.len() - 1)],
+        );
         s.fullscreen_on_stream = fullscreen_row.is_active();
         s.inhibit_shortcuts = inhibit_row.is_active();
         s.mic_enabled = mic_row.is_active();