feat(ui): XPS workbench Ribbon entries, Overlay naming, catalog context menu

[Limdongcheng]

Summary

• XPS datasets get an Analyze ▸ XPS group: four navigation commands open the XPS workbench on its Acquisition, Background, Components, or Diagnostics page in the right sidebar, with the current page checked. The workbench pages become palette-searchable for the first time, and the Analyze tab is no longer near-empty for XPS work.
• The trace-alignment group drops the bare "Align" title, which collided with Arrange's object alignment and Process's spectrum alignment; it reads "Overlay" now.
• The canvas context menu routes its grid, spacing, order, snap, layout-grid and canvas-settings rows through the command catalog, rendered by the same menu-row helper as the in-window menu bar, so labels, enabled state, shortcuts, and checkmarks cannot drift from the Ribbon and the palette.
• Docs: a Ribbon reference page (EN and zh-CN) lists the tab and group vocabulary users see on screen and the width behaviour; the UI overview names the right sidebar's Dataset tools and the CRAFT task-dock tab, and the pages that pointed at an undefined "toolbar" now name the actual surface.

Validation

• cargo pr-check passes (fmt, file size, dependency policy, both frontends, clippy with denied warnings, tests).
• npm run build in docs/ passes with the new reference page in the sidebar.

UI display logic

• New or changed actions go through the command catalog (CommandId +
  describe) and are searchable in the command palette.
• Hiding happens only at Ribbon-group level (dataset kind or width
  budget); transient states disable with a disabled_reason that says how
  to unblock. (The XPS group is hidden for non-XPS datasets; its commands
  disable in the palette with "Open an XPS dataset before using the XPS
  workbench.")
• No layout changes from background events; panels are never auto-closed.
  (The workbench commands reveal the right sidebar on a user action only.)
• New panels or empty regions show an empty state with a next step. (None
  added.)
• Docs updated in docs/ (English and zh-CN) for user-visible behavior.

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