ui: put the decoded FCI in a named bordered block (v2.7.12)

The file manager's decoded FCI rows now sit in a fieldset matching the
phone-simulator containers, with the symbolic file name as its legend
(pysimFsInfoHtml(sel, name)); the metadata line stays above the border.
Without a name the fieldset renders without a legend, and without
fci_hex no block is shown at all.

- tests: fieldset/legend markup, metadata line before the border, no
  legend without a name, escaped legend text, no fieldset without FCI.
- help EN/RU mention the named FCI block.

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "pysim-simple-server"
-version = "2.7.11"
+version = "2.7.12"
 description = "HTTP REST server wrapping pysim for the SIMple PWA"
 requires-python = ">=3.8"
 # pysim is a git-only dependency installed explicitly by setup.bat/setup.sh.