Upgrade to Nextcloud 25 design

[ChristophWurst]

• Drop incompatible Nextcloud 22-24 support
• Bump the version to reflect the breaking change(s)
• Update ´@nextcloud/vue` to v7
  • Fix imports
  • Fix vue/vue-template-compiler version mismatches
• Migrate icons.scss to a icons.css or process through webpack
• Requires Migrate to material icons groupware#38

[codecov]

Codecov Report

Merging #4459 (ebc0efa) into main (4beeca5) will not change coverage.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##               main    #4459   +/-   ##
=========================================
  Coverage     29.40%   29.40%           
  Complexity      330      330           
=========================================
  Files           220      220           
  Lines          7700     7700           
  Branches       1017     1017           
=========================================
  Hits           2264     2264           
  Misses         5436     5436           

Flag	Coverage Δ
javascript	20.49% <0.00%> (ø)
php	68.80% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ppNavigationHeader/AppNavigationHeaderViewMenu.vue	0.00% <0.00%> (ø)
...components/AppNavigation/AppointmentConfigList.vue	0.00% <0.00%> (ø)
...ppointmentConfigList/AppointmentConfigListItem.vue	0.00% <0.00%> (ø)
...ts/AppNavigation/CalendarList/CalendarListItem.vue	0.00% <0.00%> (ø)
...alendarList/CalendarListItemSharingPublishItem.vue	0.00% <0.00%> (ø)
...ion/CalendarList/CalendarListItemSharingSearch.vue	0.00% <0.00%> (ø)
.../CalendarList/CalendarListItemSharingShareItem.vue	0.00% <0.00%> (ø)
...nts/AppNavigation/CalendarList/CalendarListNew.vue	0.00% <0.00%> (ø)
...Navigation/CalendarList/PublicCalendarListItem.vue	0.00% <0.00%> (ø)
...components/AppNavigation/CalendarList/Trashbin.vue	0.00% <0.00%> (ø)
... and 43 more

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[ChristophWurst]

Split into multiple PRs