Refactor MediaAssetViewModeToggle to use toggle-group component

[coderabbitai]

Context

The MediaAssetViewModeToggle component in src/platform/assets/components/MediaAssetViewModeToggle.vue was added in PR #7729. During review, it was noted that:

• The component overrides many button styles
• It's a single-use component, which we're trying to move away from

Proposed Solution

Refactor this component to use the toggle-group component being introduced in PR #7767, which is based on shadcn-vue's toggle-group.

References

• Original PR: [QPOv2] Add media assets viewmode toggle #7729
• Comment thread: [QPOv2] Add media assets viewmode toggle #7729 (comment)
• Toggle-group PR: feat: add label support to boolean toggle widgets #7767
• Requested by: @benceruleanlu

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