fix: JSONata $message variable refs inside ~{} expressions always resolve to undefined

[droarty]

Problem

Inside ~{ ... } blocks in workflow JSON configs, expressions are evaluated via JSONata's expr.evaluate(context). In JSONata, $identifier is a bound variable, not a path. Since no variable named $message is ever bound, $message is always undefined inside JSONata:

• user-dashboard.json: $count($message.groups) = 0 → $count(undefined) = 0 → 0 = 0 → always true → "no groups" message always shows even when user has groups
• group-dashboard.json: $message.id = 'manage-documents' → undefined = '...' → always false → wrong right-panel text in admin panel

The correct JSONata path syntax for context.message.groups is message.groups (no $ prefix), since context is the root input $.

Fix

• user-dashboard.json: $count($message.groups) → $count(message.groups)
• group-dashboard.json: $message.id → message.id in the open-admin-panel handler