fix: restore missing keybinding validation guards

persistence.ts imported isActionWithOptionalArgs and isShortcutKey,
neither of which existed at runtime — loading persisted custom
keybindings would crash. Adds actions/guards.ts (excluding required-args
actions per TActionArgsMap) and isShortcutKey in keybinding.ts; the nine
previously dead persistence tests now pass.

1 files changed, 1 insertions, 0 deletions

diff --git a/apps/web/src/actions/index.ts b/apps/web/src/actions/index.ts
index 801a846a..d74a31a5 100644
--- a/apps/web/src/actions/index.ts
+++ b/apps/web/src/actions/index.ts
@@ -1,3 +1,4 @@
 export * from "./definitions";
 export * from "./types";
 export * from "./registry";
+export * from "./guards";