ui: sort the file manager tree by FID or symbolic name

- pysimFsSortChildren() groups DFs above EFs, then sorts each group by
  FID (default) or case-insensitive symbolic name; missing names fall
  back to the FID as the sort key; deterministic tie-break; the input
  array is not mutated
- render uses the sorted copy, so lazily loaded directories and custom
  file injections are sorted too
- FID / Name pills above the tree (pysimFsSetSort) persist the choice in
  localStorage (otaman_fs_sort) and re-render without refetching
- tests for the comparator (DF priority, both keys, fallbacks, custom
  entries, no mutation) and the pill wiring; help/README updated;
  SW cache v108 -> v109.

README.md

@@ -486,6 +486,7 @@ Connects to the bundled [`pysim-otaman-server`](pysim_otaman_server/) for live c
 
 Browse the UICC filesystem in a tree view. Files are shown with names, FIDs, and AIDs (for ADFs). Click to read contents.
 
+- Entries are grouped with DFs above EFs and sorted by **FID** or symbolic **Name** (pills above the tree, remembered in `localStorage`)
 - **Read** — reads the selected file (auto-detects transparent vs record files)
 - **Edit** — switch to edit mode, modify hex data, click **Save** to write back
 - **Raw / Decoded** — toggle between hex dump and pysim-decoded JSON view