feat: add search with preview

internal/app/keys.go

@@ -23,6 +23,9 @@ type KeyMap struct {
 
 	// Editing
 	EnterEdit key.Binding
+
+	// Search
+	Search key.Binding
 }
 
 // DefaultKeyMap returns the default keybindings
@@ -84,6 +87,10 @@ func DefaultKeyMap() KeyMap {
 			key.WithKeys("i"),
 			key.WithHelp("i", "edit transcript"),
 		),
+		Search: key.NewBinding(
+			key.WithKeys("s"),
+			key.WithHelp("s", "search cues"),
+		),
 	}
 }
 
@@ -109,5 +116,8 @@ Navigation (Global):
   G           Go to last cue
 
 Editing:
-  i           Edit in $EDITOR at cue`
+  i           Edit in $EDITOR at cue
+
+Navigation:
+  s           Search cues`
 }