fix: enhance empty state dashboard layouts for disconnected GitHub account

[KGFCH2]

Related Issue

Closes #136

Summary

Replaces static dashes with actionable connection paths.

Changes Made

• Modified DashboardPage.jsx to render an empty state card with redirect for GitHub connectivity.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: b672be03-8302-49d5-a05a-3525077aa62d

📥 Commits

Reviewing files that changed from the base of the PR and between 9390870 and 6df5440.

📒 Files selected for processing (1)

• frontend/src/pages/DashboardPage.jsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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