feat: allow symbol navigation buttons to open in new tab

[msukkari]

Summary

This PR enables users to open code navigation buttons ("Go to definition" and "Find references") in a new tab by using Cmd+click (Mac) or Ctrl+click (Windows/Linux).

Changes

• useBrowseNavigation.ts: Added createBrowsePath function that returns the URL path without navigating, allowing components to use it as an href attribute
• symbolHoverPopup/index.tsx:
  • Replaced button elements with Next.js Link components for proper Cmd+click / Ctrl+click support
  • Added gotoDefinitionHref and findReferencesHref memos to compute the navigation URLs
  • When a definition is available, renders as a Link with button styling
  • When loading or no definition found, renders as a disabled LoadingButton
  • Analytics/audit logging is captured via the onClick handler

How it works

The buttons now render as Next.js Link components with the navigation URL in the href prop. Next.js Link components natively support modifier key clicks:

• Regular click: Navigate in the current tab (same behavior as before)
• Cmd+click (Mac) / Ctrl+click (Windows): Opens in a new tab via native browser behavior
• Middle-click: Opens in a new tab
• Right-click → Open in new tab: Standard browser context menu works

This works in both the file browser (/browse) and in Ask sessions when hovering over symbols in code citations.

Fixes #847

Linear Issue: SOU-847

  

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