Implement pin comment action for HD Ticket Comments

[Copilot]

Enables comment owners to pin/unpin their comments. Pinned comments appear at the top of ticket activity, maintaining chronological order within pinned and unpinned groups.

Backend

• Modified get_comments() query to order by is_pinned DESC, creation ASC
• Uses existing is_pinned field from HD Ticket Comment DocType

Frontend

• Added Pin/Unpin action to comment dropdown menu (owner-only)
• Visual pin indicator (Lucide icon) with accessibility label
• Toggle via frappe.client.set_value with toast feedback
• Passed isPinned through activity pipeline from API to CommentBox

Tests

• test_pinned_comments_appear_first() - verifies pinned comments sort before unpinned
• test_multiple_pinned_comments_order() - verifies chronological ordering within groups

Original prompt

Implement a “pin comment” action for HD Ticket Comments so owners can pin/unpin their comments and pinned comments appear at the top of ticket activity. Details:

• Use the existing is_pinned field in helpdesk/helpdesk/doctype/hd_ticket_comment/hd_ticket_comment.json (field label “Is pinned”).
• Locate the computed property that gathers ticket activities and update it to return pinned comments first (preserve relative ordering within pinned and unpinned groups, preferably most-recent-first as today).
• Add a “Pin” action alongside existing owner actions (edit/delete) in the ticket comment UI. When clicked, set is_pinned=1; allow unpinning (toggle) as appropriate.
• Ensure permission checks: only the comment owner should see the pin/unpin action.
• Update any server/API endpoints if required to persist the is_pinned change.
• Add/adjust tests if the repo has existing tests for ticket activities or comment actions.
• Manual verification: pinned comments appear at the top of ticket activity list and remain sticky across reloads.
  Issue context: Pin comments in Ticket #2871.

This pull request was created from Copilot chat.

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