feat: view E2EE files

[luka-nextcloud]

📝 Summary

• Resolves: Viewing E2EE files #6934

🖼️ Screenshots

🏚️ Before

🏡 After

🏁 Checklist

• Code is properly formatted (npm run lint / npm run stylelint / composer run cs:check)
• Sign-off message is added to all commits
• Tests (unit, integration and/or end-to-end) passing and the changes are covered with tests
• Documentation (README or documentation) has been updated or is not required

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 32 lines in your changes missing coverage. Please review.

Project coverage is 51.82%. Comparing base (67efbd4) to head (0b17f6a).

Files with missing lines	Patch %	Lines
src/components/ViewerComponent.vue	0.00%	31 Missing ⚠️
src/helpers/mime.js	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7132      +/-   ##
==========================================
- Coverage   51.85%   51.82%   -0.03%     
==========================================
  Files         479      479              
  Lines       41467    41491      +24     
  Branches     1004     1004              
==========================================
  Hits        21504    21504              
- Misses      19858    19882      +24     
  Partials      105      105              

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