fix: map openCharacterDictionary session action to --open-character-dict

- Add missing Lua CLI dispatch entry for openCharacterDictionary
- Add regression test for Alt+Meta+A binding and CLI flag forwarding

plugin/subminer/session_bindings.lua

@@ -159,6 +159,8 @@ function M.create(ctx)
 			return { "--open-youtube-picker" }
 		elseif action_id == "openSessionHelp" then
 			return { "--open-session-help" }
+		elseif action_id == "openCharacterDictionary" then
+			return { "--open-character-dictionary" }
 		elseif action_id == "openControllerSelect" then
 			return { "--open-controller-select" }
 		elseif action_id == "openControllerDebug" then