perf(app-routes): lazy load message queues and meter components

[H4ad]

📄 Summary

These two components probably were forgot to be included in the lazy load components.

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✅ Changes

Before:

After:

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🧪 How to Test

1. Press F12
2. Go to performance tab
3. Press record and reload (CTRL + SHIFT + E)
4. Wait for 5s and then stop.

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📋 Checklist

• Dev Review
• Test cases added (Unit/ Integration / E2E)
• Manually tested the changes

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Note

Improves route-level code-splitting by lazy-loading previously eagerly-loaded pages.

• Adds Loadable exports for MessagingQueues, MeterExplorer, and AlertTypeSelectionPage in pageComponents.ts
• Updates routes.ts to import these components from pageComponents (instead of direct imports) and use them for existing routes
• Renames MessagingQueuesMainPage export to MessagingQueues for consistency

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[YounixM]

@H4ad - Please check the conflict.

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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