chore: Migrate to Node API

[artonge]

Migration from manipulating "raw" WebDAV results to parsing them with resultToNode from @nextcloud/files.

Principal changes are:

• Rewrite usages of node.filename to node.root + node.path
• Access node attributes with node.attributes... instead of node...
• Rewrite the store to prevent having to overload node objects with extra properties.
• Consolidate store typing by:
  • typing vue.$store
  • dropping mapState, mapGetters, mapActions which were not typed and were messing with the components typing.
  • using this.$store... to access the state

I did some manual testing to fix most if not all the introduced issues. Cypress tests would have been appreciated, but I need to focus on new features now.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 2.28%. Comparing base (1f8c96a) to head (999d49b).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #2968      +/-   ##
=========================================
- Coverage    2.31%   2.28%   -0.03%     
=========================================
  Files          98      97       -1     
  Lines        6190    6214      +24     
  Branches      112     111       -1     
=========================================
- Hits          143     142       -1     
- Misses       6047    6072      +25     

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