Add command bypass and internal UI sessions to Wayland keyboard backend

internal/platform/wayland/keyboard.go

@@ -43,6 +43,7 @@ type Keyboard struct {
 	done             chan struct{}
 	wake             chan struct{}
 	updates          chan keyboardUpdate
+	uiUpdates        chan uiUpdate
 	commands         chan input.CommandEvent
 	locks            chan input.LockState
 	failures         chan error
@@ -52,12 +53,17 @@ type Keyboard struct {
 	secureGeneration atomic.Uint64
 	enabled          atomic.Bool
 	browse           atomic.Bool
+	bypass           atomic.Bool
 	nativeButton     atomic.Bool
 	applied          atomic.Bool
 	browseApplied    atomic.Bool
+	bypassApplied    atomic.Bool
 	active           atomic.Bool
 	learn            atomic.Bool
 	learnEcho        atomic.Bool
+	uiSession        atomic.Uint64
+	uiSequence       atomic.Uint64
+	uiClose          atomic.Uint64
 	overflow         atomic.Uint64
 	intent           input.IntentTracker
 }
@@ -69,7 +75,7 @@ func New(modifiers []string, layout input.KeyboardLayout, logger *slog.Logger) *
 	keyboard := &Keyboard{
 		logger:        logger,
 		configuration: keyboardConfiguration{layout: layout, modifiers: append([]string(nil), modifiers...)},
-		wake:          make(chan struct{}, 1), updates: make(chan keyboardUpdate),
+		wake:          make(chan struct{}, 1), updates: make(chan keyboardUpdate), uiUpdates: make(chan uiUpdate),
 		commands: make(chan input.CommandEvent, 32), locks: make(chan input.LockState, 16),
 		failures: make(chan error, 1), events: make(chan input.Event, 64),
 	}
@@ -155,6 +161,16 @@ func (keyboard *Keyboard) SetBrowseNavigation(enabled bool) {
 	keyboard.browse.Store(enabled)
 	keyboard.notify()
 }
+
+// SetCommandBypass drops every key grab except the bypass shortcut after
+// held keys release. Watched keys still report monitoring and echo; the
+// shared interface has no key synthesis, so reader-modifier chords other
+// than the retained shortcut are swallowed rather than replayed.
+func (keyboard *Keyboard) SetCommandBypass(enabled bool) {
+	keyboard.bypass.Store(enabled)
+	keyboard.notify()
+}
+func (keyboard *Keyboard) CommandBypassEnabled() bool { return keyboard.bypassApplied.Load() }
 func (keyboard *Keyboard) SetNativeButtonFocus(focused bool) {
 	keyboard.nativeButton.Store(focused)
 	keyboard.notify()