Add clickable links for empty sessions in Diagnostic Report

[Copilot]

Empty sessions in the Diagnostic Report displayed as non-clickable "—" while sessions with interactions showed clickable title links. This prevented accessing debug details for empty sessions that may contain relevant metadata.

Changes

Modified src/webview/diagnostics/main.ts:

• Session table rendering: Changed conditional to always render clickable links. Empty sessions now display "(Empty session)" instead of "—"
• CSS styling: Added .empty-session-link class with normal (#999) and hover (#aaa) states for visual distinction from regular session links (#4FC3F7 / #81D4FA)

// Before: non-clickable for empty sessions
${sf.title ? `<a href="#" class="session-file-link"...>${sf.title}</a>` : '<span style="color: #666;">—</span>'}

// After: clickable for all sessions
${sf.title ? `<a href="#" class="session-file-link"...>${sf.title}</a>` : `<a href="#" class="session-file-link empty-session-link"...>(Empty session)</a>`}

The openSessionFile command now works consistently for all sessions regardless of interaction count.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[FEATURE] Add link to empty sessions</issue_title>
<issue_description>For Diagnostic Report we include empty sessions as well, however they contain some data, which might be in interest to access. Add the link to those sessions with details from the debug as it is done for sessions with interaction:

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [FEATURE] Add link to empty sessions #155

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[rajbos]

This works, sweet!