Closes hyperhive#2788.
State::Skipped now rides the wire (per hive-host-sock's dag_view, no
longer filtered) — this was the last missing piece: the frontend had
no glyph for it, so a skipped node's per-node chip fell through to
QUEUE_STATE_GLYPH's '?' fallback.
Added a 'skipped' entry (·, same quiet glyph hivectl already uses for
the same state — no contract between them, just consistent taste) and
a .rqe-node-skipped CSS rule (dimmed only, no strikethrough —
deliberately distinct from .rqe-node-cancelled: a skipped node wasn't
dropped mid-flight, it was never going to run, so it should read as
expected/quiet rather than alarming). rollupState's defensive arm
(every(n => skipped || done) => done) already landed in #2799 and
needed no changes here.
buildNodeTree has no state-based filtering, so skipped nodes render
in the tree exactly like any other node kind — no other changes
needed. Verified with a full frontend build; nix fmt clean.
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