The tabs.js split's render-heavy domains (schedules, system, containers,
questions/approvals) all share a handful of pure helpers that lived in
the tabs.js IIFE: paintAtomic (atomic-swap render) and the fmtAgo /
fmtElapsed / fmtDuration / truncate formatters (used 10/15/4/6/6 times
across the file). Pull them into a new dashboard-internal util.js so the
upcoming per-tab modules can import them instead of depending on the
entry's closure — the helper analogue of the state.js roster keystone.
They stay out of the cross-page common.js (their phrasing is
dashboard-specific) but are now a shared dashboard module. All five are
pure, so this is behaviour-preserving code motion; esbuild inlines util.js
into the tabs.js bundle. Build green.
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