refactor: move canned responses into settings modal

[pratikb64]

This PR enhances the canned responses feature by relocating it from the page to Settings modal, and introduces powerful new capabilities: dynamic content via Jinja templating and scoped visibility controls (Global, Team, Personal).

Key Changes

1. Relocated Canned Responses
   Moved the canned responses management interface from scattered page-level UIs into a unified section within the Settings modal for better discoverability and maintainability.

2. Dynamic Field Support
   Added support for Jinja2 templates in canned responses with auto-complete feature, enabling dynamic content insertion (e.g., {{ contact }}, {{ full_name }}) for personalized and context-aware replies.

3. Visibility Scoping
   Introduced visibility scopes to control who can access each canned response:

   • Global: Available to all users across the organization
   • Team: Restricted to members of the specific teams
   • Personal: Visible only to the creator

Docs: https://docs.frappe.io/helpdesk/canned-response

Demo

2025-10-29.14-48-46.mp4