feat(web): Add Linear issue link card UI for chat responses

[msukkari]

Overview

When Ask Sourcebot generates a response that references a Linear issue (i.e., a linear.app link), the link now renders as a rich card-style UI instead of a plain markdown hyperlink.

Changes

• Add Linear logo SVG asset (packages/web/public/linear.svg) - Using the official Linear logomark with currentColor for theme support
• Create LinearIssueCard component (packages/web/src/features/chat/components/chatThread/linearIssueCard.tsx) - Card-style UI showing:
  • Linear logo
  • Issue identifier (e.g., SOU-818) in monospace font
  • Humanized title extracted from URL slug
  • External link icon
  • Opens in new tab on click
  • Styled with border, muted background, rounded corners, and hover state
• Add custom anchor renderer to MarkdownRenderer - Detects Linear issue URLs with pattern https://linear.app/<org>/issue/<IDENTIFIER>/<slug> and renders them as cards

Screenshots

Linear Issue Card Rendered in Chat

Linear issue card rendered in chat

Card Details (Zoomed)

Zoomed view showing Linear logo, identifier, title, and external link icon

Hover State

Card hover state showing the full Linear URL

Acceptance Criteria

• Linear issue links in chat responses render as a styled card/chip (not a plain hyperlink)
• Card shows: Linear logo, issue identifier (e.g., SOU-818), and humanized title
• Card opens in a new tab on click
• Fallback to a regular link if URL parsing fails
• Works in both light and dark mode (logo uses dark:invert)
• Non-Linear links are unaffected (rendered with default new-tab behavior)

Fixes SOU-823

Linear Issue: SOU-823

  

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• Commit unit tests in branch cursor/SOU-823-linear-issue-link-cards-681e

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