[BUG] public templates modal should only list importable templates

[mohammadsherif0]

Describe the Bug:

Public Templates lists all public templates and allows opening any of them read-only. Non-admins should only see templates they are allowed to copy (document types), not email templates they cannot import.

Reproducibilty:

• Yes
• No
• Sometimes

Steps to Reproduce the Behavior:

1. Log in as non-admin user.
2. Templates → Public Templates.
3. Observe email templates listed; use View on a template you cannot copy.

Expected Behavior:

Only show templates the user can import. No read-only access to templates they cannot own/copy.

Actual Behavior:

All public templates shown. View opens /template/:id even when copy is denied server-side.