Fix Preview View Switcher to receive good currentView

[charlesh88]

• Closes View Switcher doesn't populate label in Preview container #8310
• Format and pass properly constructed current-view to ViewSwitcher, based on BrowseBar.vue.

Describe your changes:

Updated the currentView computed property to return the view provider object from the viewProviders array instead of the actual view instance. This matches what ViewSwitcher expects - an object with properties like cssClass and name rather than the view instance with methods like show and destroy.

The computed property now:

• Finds the provider in viewProviders that matches the current viewKey
• Returns that provider object (which has the expected structure)
• Falls back to an empty object if no match is found
• This aligns with how BrowseBar.vue handles the same situation.

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Is this a notable change that will require a special callout in the release notes? For example, will this break compatibility with existing APIs or projects that consume these plugins?

Author Checklist

• Changes address original issue?
• Tests included and/or updated with changes?
• Has this been smoke tested?
• Have you associated this PR with a type: label? Note: this is not necessarily the same as the original issue.
• Have you associated a milestone with this PR? Note: leave blank if unsure.
• Testing instructions included in associated issue OR is this a dependency/testcase change?

Reviewer Checklist

• Changes appear to address issue?
• Reviewer has tested changes by following the provided instructions?
• Changes appear not to be breaking changes?
• Appropriate automated tests included?
• Code style and in-line documentation are appropriate?

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 56.20%. Comparing base (e5120e9) to head (24d3a12).

Files with missing lines	Patch %	Lines
src/ui/preview/PreviewContainer.vue	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8311      +/-   ##
==========================================
- Coverage   57.21%   56.20%   -1.01%     
==========================================
  Files         728      728              
  Lines       29676    29677       +1     
  Branches     2804     2805       +1     
==========================================
- Hits        16978    16679     -299     
- Misses      12358    12658     +300     
  Partials      340      340              

Flag	Coverage Δ
e2e-ci	61.47% <ø> (-2.96%)	⬇️
e2e-full	39.46% <ø> (-0.02%)	⬇️
unit	46.39% <50.00%> (-0.02%)	⬇️

Files with missing lines	Coverage Δ
src/ui/preview/PreviewContainer.vue	26.66% <50.00%> (-0.37%)	⬇️

... and 36 files with indirect coverage changes

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