enh/y indexeddb

[max-nextcloud]

• wip: try y-indexeddb
• chore(split) useIndexedDbProvider from Editor.vue
• fix(cron): do not reset document
• enh(yjs): store baseVersionEtag alongside doc
• Fixes: Persist document state in browser IndexedDB storage #7415

TODOs

• Think through other file operations.
• Typing without network, closing the editor, opening it again: no content lost
• After closing and opening the editor, undo history is empty
• Add base_version_etag as custom property to IndexedDB
  • After loading document from IndexedDB, send baseVersionEtag as part of create request
  • In case of conflict, use existing manual conflict handling
  • After manual conflict handling, reset y-indexeddb provider for document
  • Fix endless reload loop when base version has been cleared:
    • Open file with version in indexed db but on a different baseVersionEtag.
    • Different versions are detected. Reload button is offered.
    • Reload does not change the indexed db content - so conflict persists.
  • Test... start editing offline, overwrite file in other tab, see what happens when getting back online @max-nextcloud
• Opening editor: steps from IndexedDB that didn't get sent to server yet need to get pushed
• Opening editor: when steps from IndexedDB didn't get sent to server yet, unsaved changes should be indicated and saved
• cleanup yDoc file server-side when file is deleted @mejo-
• cleanup client side state for deleted files
• config flag

[codecov]

Codecov Report

❌ Patch coverage is 31.81818% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.98%. Comparing base (67d597f) to head (62c82f5).

Files with missing lines	Patch %	Lines
src/services/SyncService.ts	12.50%	6 Missing and 1 partial ⚠️
src/helpers/yjs.ts	0.00%	3 Missing and 1 partial ⚠️
src/composables/useConnection.ts	71.42%	1 Missing and 1 partial ⚠️
src/services/WebSocketPolyfill.ts	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7621      +/-   ##
==========================================
- Coverage   47.06%   46.98%   -0.09%     
==========================================
  Files         141      141              
  Lines        3886     3893       +7     
  Branches      733      735       +2     
==========================================
  Hits         1829     1829              
- Misses       1763     1768       +5     
- Partials      294      296       +2     

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