/* ============================================================================ SLAB TOOL HEADER — THE ONE COPY. ---------------------------------------------------------------------------- WHY THIS FILE EXISTS. Every page in Slab carried its own hand-pasted copy of `.main-hdr`, `.pg-title`, `.hdr-right`, `.hdr-icon`, `.hdr-upd` … and they had drifted into SEVEN different `.main-hdr` rules across sixteen pages (some with `gap:16px`, some with none; two with `min-height:86px`; one with `flex-wrap`). Each copy carried a comment claiming it matched the others. That is the same shape of bug that made four hand-copied money rules disagree and understate the invoices register, so the header is now ONE file that every page links. WHY A LINKED STYLESHEET AND NOT nav.js. The header's look USED to arrive as CSS injected at runtime: `.hdr-status` / `.hdr-primary` from nav.js, `.hdr-icon` from nav.js's notification layer, `.hdr-disc` from slab-comments.js — and slab-comments.js only injected on `SlabComments.mount()`, which the proposal page called from `boot()`, i.e. AFTER a Promise.all of three API calls. Measured on production 2026-08-23: nav.js finished at 273ms but `/api/v2-projects` answered at 2671ms, so the Discussion button sat there as a raw unstyled browser