feat: replace alert() dialogs with Sonner toast notifications

[gautamsidhwani29]

Problem

The dashboard used native browser alert() for success and error messages across multiple pages. These block the UI thread, look outdated, and provide poor UX.

Solution

Replaced all alert() calls with Sonner toast notifications.
Fixes #248

Changes

• Installed sonner package
• Added <Toaster /> to App.jsx
• Replaced all alert() calls with toast.success() and toast.error() in:
  • Jobs.jsx
  • Queues.jsx
  • Pods.jsx
  • PodGroups.jsx
  • JobEditDialog.jsx
  • EditQueueDialog.jsx

Screenshots :

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[gemini-code-assist]

Code Review

This pull request replaces native browser alert() calls with the sonner library to provide modern toast notifications across the frontend. The changes involve adding the sonner dependency, integrating the Toaster component in App.jsx, and updating multiple components to use the new notification system. Review feedback recommends restoring context-aware error messages in the Jobs component and using semantic methods like toast.info for unimplemented features to ensure consistency with the rest of the application.

[gemini-code-assist]

The error message prefix "Error creating job: " was removed during the transition from alert() to toast.error(). This makes the notification less context-aware compared to the previous implementation and other similar components in the codebase (e.g., Pods.jsx).

Suggested change

	toast.error(errorMsg);
	toast.error("Error creating job: " + errorMsg);

[gemini-code-assist]

For consistency with the rest of the application and to leverage the richColors configuration in App.jsx, it is recommended to use a semantic toast method like toast.info() instead of the generic toast() call for "not implemented" messages.

Suggested change

	toast("Create PodGroup not implemented yet");
	toast.info("Create PodGroup not implemented yet");