- "Expand all" / "Collapse all" links in the sort row: expand-all walks
the directory tree loading children on demand (skipping DFs the probe
found absent), collapse-all resets every directory.
- Selecting any filter but "All" auto-expands the tree so the matched
files are visible (pysimFsAutoExpandForFilter, wired into the two
filter setters).
- i18n EN/RU for the two links.
Frontend 1163 tests green (+2). (Version/sw bump still deferred.)