fix(hub): poll for a root count change instead of trusting one fetch

Point 1 (directory list not updating without a full page reload) turned
out to still reproduce after the earlier onRefreshIndex fix — that one
addressed the Videos/Music root pickers (nodeDirs), but this section's own
list reads a different field entirely (ops.list_groups returns the
*runtime* root set, groups_ctx[gid]["roots"]) that only gets replaced once
_reload_config_inner's retarget actually finishes. /api/reload itself is
fire-and-forget on the node by design (ops.start_reload's own docstring —
a brand-new group's initial scan can take minutes, the caller must not
block on it), so a single loadNodeInfo() call right after can land in the
gap before that replacement happens and show the pre-change count.

Both the add and remove handlers now poll /api/groups (up to ~4s, every
400ms) until the root count actually matches what the action should have
produced, rather than fetching once and hoping the timing worked out.

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