ui: show FID, layout and decoded FCI in the file manager detail pane

- selecting an EF now renders an info block between the File: title and
  the contents: FID, file type, size, record length/count (nulls skipped)
  followed by the decoded FCI via the existing profilerFciPreviewItems()
  decoder (no raw hex), matching the snapshot detail view
- pysimFsInfoHtml() is pure and reused by pysimFsClickFile(); the [LF]
  shorthand stays in the title; custom files get the same metadata from
  the temporary select probe
- tests: pysimFsInfoHtml in profiler.test.js (full response, missing
  fci_hex, skipped nulls) and a structural check for #pysim-fs-info;
  help EN/RU and READMEs updated; SW cache v119 -> v120.

README.md

@@ -490,6 +490,7 @@ Browse the UICC filesystem in a tree view. Files are shown with names, FIDs, and
 - **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
+- Selecting a file shows its FID, file type, size / record layout and the decoded FCI above the contents
 - Missing files are shown in red (✗); a present but empty DF shows `(empty)`
 - **Probe all files** — walks the whole tree (incl. custom files), marks every entry present/absent with *N / total* progress, stoppable, and ends with a summary; browsing itself stays lazy