feat: Multiselected tabs support for folders, p=#9941

* feat: Multiselected tabs support

* refactor(folders): Store active tabs as direct references in folders and better handling collapsed items

* fix: Refine tab visibility and state management

* feat:  Add ungroup for multiple selected tabs drag and drop, b=no-bug, c=folders, tabs

* fix: Fixed wrong calculation of indentation and other small refactoring, b=no-bug, c=common, folders, tabs

* fix: Fixed restoring split views, b=no-bug, c=folders, workspaces

* test: Added tests for visible tab, b=no-bug, c=folders, tests, tabs

* feat: Folder active tabs are always visible, b=no-bug, c=folders

* fix: Fixed duplicate tabs appearing on the tab search list, b=no-bug, c=folders

* feat: Added support for active folder unload, b=no-bug, c=folders

* fix: first implementation `expandToSelected`

* fix: Formatting

* fix: Some minor fixes, b=no-bug, c=folders, tabs

* fix: Improve collapse visible tab function, b=no-bug, c=folders

* test: Added folder level tests, b=no-bug, c=folders, tests

---------

Signed-off-by: mr. m <91018726+mr-cheffy@users.noreply.github.com>
Co-authored-by: mr. m <91018726+mr-cheffy@users.noreply.github.com>
Co-authored-by: Mr. M <mr.m@tuta.com>

package.json

@@ -8,7 +8,7 @@
   "scripts": {
     "build": "surfer build",
     "build:ui": "surfer build --ui",
-    "start": "cd engine && python ./mach run --noprofile",
+    "start": "cd engine && python3 ./mach run --noprofile",
     "import": "npm run ffprefs && surfer import",
     "export": "surfer export",
     "init": "npm run download && npm run import && npm run bootstrap",