fix(sw): refine process header empty title states and UI guidance

- AI_GUIDE stage 5 "Header 전용 스타일의 적용 범위": header-only styles stay
  in the header (SW SWHeader / SWProcessHeader / SWViewerHeader, Web GNB /
  LNBMobileHeader / DashboardHeader); no header CSS or tokens on body UI,
  no global overrides, layout-only joins, package-shared tokens unchanged,
  whole-screen use only on explicit request. Synced to the 4 package
  copies; referenced from stage 6, SW and Web AI_USAGE §3
- SWProcessHeader: with documentTitle "" the file name keeps #AEDBCC on
  hover and a default cursor (root data-document-untitled). The button,
  focus and onDocumentClick are kept; a real file name keeps the yellow
  hover and pointer. Visual vs. click difference recorded as a UX item
- Step enablement documented as implemented: only an explicit disabled
  (step, group, process, header) turns steps off; project / file state
  never does; selection is activeStepId + onStepSelect (also for host
  previous / next); no activeStepId and empty groups described
- Regression check tests/process-header-states.check.mjs (15/15);
  typecheck:sw, build:sw, check:ai-docs pass; public-api keeps its 3
  existing failures, none new

packages/sw/src/theme/sw-process-header.css

@@ -470,7 +470,11 @@
   text-align: right;
   text-shadow: var(--hm-sw-header-label-outline);
 }
-.hm-sw-process-header[data-document-empty] .hm-sw-header__document-button:not(:hover) .hm-sw-header__document-name { color: var(--hm-sw-process-document-empty-color); }
+/* 2026-11-05: before a file exists (documentTitle "") the file name does not look clickable: the label keeps its color
+   on hover (was #FFC600 like a file name) and the cursor stays default. Size, place, colors and the click are unchanged;
+   a real file name keeps the SWHeader hover. */
+.hm-sw-process-header[data-document-empty] .hm-sw-header__document-button .hm-sw-header__document-name { color: var(--hm-sw-process-document-empty-color); }
+.hm-sw-process-header[data-document-untitled] .hm-sw-header__document-button { cursor: default; }
 
 /* ---------- appearance="multi" (StrAna-SW multi step, Figma 873:16481 / 873:16254 / 873:17421) ----------
    Same markup and shared rules as the default; only sizes, the file name, the tool pill and the group content differ.