fix(webui): align extension page snackbars

[1zzxy1]

Summary

• align the Extension page snackbar position with the app's shared toast convention
• show install/update/uninstall result messages at top center instead of the default bottom position
• keep the fix limited to the local Extension page snackbar without changing existing install logic

Fixes #6022

Testing

• git diff --check
• frontend build/lint not run locally in this environment (dashboard dependencies/pnpm unavailable)

Summary by Sourcery

Enhancements:

• Update the extension page snackbar to display at the top center to match global toast positioning.

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request standardizes the display of notification snackbars on the Extension page. It improves user experience by ensuring consistency with the application's overall UI conventions for displaying transient messages, specifically by centralizing success/failure notifications.

Highlights

• Snackbar Alignment: Aligned the snackbar position on the Extension page to match the application's shared toast convention.
• Notification Placement: Changed install/update/uninstall result messages to display at the top center instead of the default bottom position.
• Scope Limitation: Ensured the fix is limited to the local Extension page snackbar without altering existing installation logic.

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[sourcery-ai]

Hey - I've left some high level feedback:

• Since this change is meant to align with a shared toast convention, consider centralizing the snackbar location in a shared component or config instead of setting it only on this page to avoid future divergence.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Since this change is meant to align with a shared toast convention, consider centralizing the snackbar location in a shared component or config instead of setting it only on this page to avoid future divergence.

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[gemini-code-assist]

Code Review

This pull request modifies the ExtensionPage.vue file to add a location="top center" attribute to the <v-snackbar> component. There are no review comments to provide feedback on.