Remove dead always-true runnable action field

runnable was hardcoded true on every action,
and only loaded+enabled capabilities ever
reach the registry, so every JS === false
branch was unreachable. Drop the field, its
JSON, the guards, and the orphan .disabled
CSS rule.

resources/web/dialog/SpeedDial/style.css

@@ -169,7 +169,6 @@ kbd {
   border: 1px solid var(--border, var(--orca-border, #ddd));
   border-radius: 4px;
 }
-.row.disabled { opacity: .5; cursor: not-allowed; }
 .star {
   flex: 0 0 auto;
   width: 24px;