chore(angular-react): Migrate CommentPipe to utility function

[devin-ai-integration]

Summary

Migrates the Angular CommentPipe (src/app/shared/pipes/comment.pipe.ts) to a plain exported utility function formatComment in src/utils/comment.ts.

What changed:

• Created src/utils/comment.ts with a standalone formatComment(comment: number): string function
• No Angular imports or decorators — this is a pure leaf-node utility
• Logic is a 1:1 port: returns 'discuss' for 0, '1 comment' for 1, 'N comments' for N > 1
• The original Angular pipe is not removed (per playbook rules)

Review & Testing Checklist for Human

• Verify formatComment(0) returns 'discuss'
• Verify formatComment(1) returns '1 comment'
• Verify formatComment(5) returns '5 comments'

Notes

• This is a leaf-node migration with no dependencies on other app files.
• The original Angular CommentPipe is intentionally left in place per migration playbook guidelines.

Link to Devin session: https://app.devin.ai/sessions/5e9799229da64dc9a9b2e9b41cfe1551
Requested by: @charityquinn-cognition

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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