[PER-10476] [5] Replace navigateMin with getWithChildren in folder picker

[aasandei-vsp]

Migrate the folder picker off /folder/navigateMin, its last consumer, and remove FolderRepo.navigate. The root.root folder stays on getRoot since Stela does not serve the virtual root.

Issue: PER-10476

Should not be merged before #1091

Manual test cases — Replace navigateMin with getWithChildren

Setup: log in on an archive with nested folders and at least one record. The folder picker opens from an item's Move, Copy, and Choose-file actions.
EXPECTED: the folder picker now loads folders through the Stela getWithChildren endpoint, except the top-level root which still loads through getRoot.

---

Move dialog

1. Select an item and choose Move.
   • EXPECTED: The picker opens at the root, listing My Files and Public (not Apps or Vault), and the header shows the root folder name.
2. Click into My Files, then into a subfolder.
   • EXPECTED: Each folder's subfolders load and the header name updates.
3. Press Back repeatedly up to the top.
   • EXPECTED: The root reloads with My Files and Public — no blank or errored panel.
4. Select a destination folder and confirm the Move.
   • EXPECTED: The item moves to the chosen folder and the dialog closes.

Copy dialog

1. Select an item and choose Copy.
   • EXPECTED: The picker opens at the root with the same folders as above.
2. Navigate into a folder, select it, and confirm the Copy.
   • EXPECTED: The item is copied to the chosen folder and the dialog closes.

Choose-file dialog

1. Open the record chooser (Choose file).
   • EXPECTED: Both folders and records are listed (records are not stripped).
2. Navigate into a folder and select a record.
   • EXPECTED: The record can be selected and confirmed.

Filtered move

1. Move a folder into the tree.
   • EXPECTED: The folder being moved does not appear as a destination option.

Error handling

1. With the picker open, go offline (DevTools > Network > Offline) and navigate into a folder.
   • EXPECTED: An error toast appears — no blank panel and no uncaught error in the console.

[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 52.39%. Comparing base (a5815a0) to head (86c7a96).

Files with missing lines	Patch %	Lines
...omponents/folder-picker/folder-picker.component.ts	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@                          Coverage Diff                           @@
##           PER-10476-replace-navigate-lean-v4    #1092      +/-   ##
======================================================================
+ Coverage                               52.23%   52.39%   +0.15%     
======================================================================
  Files                                     355      355              
  Lines                                   12131    12131              
  Branches                                 2191     2193       +2     
======================================================================
+ Hits                                     6337     6356      +19     
+ Misses                                   5566     5542      -24     
- Partials                                  228      233       +5     

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