Add font import for Now, Gotham and Open Sauce One overrides; package fonts for Void

Font import:
- Migration M6 adds user_fonts; files are stored content-addressed under
  the local data dir. New Rust commands inspect, import, list, read and
  remove fonts, refusing WOFF2, collections, variable fonts and
  restricted fsType, and unpacking WOFF1 to plain sfnt.
- Imported fonts register in the render worker as user:<Face> families
  with an italic alias, and are pinned in the frozen render prefs so
  issued invoices can still re-render. Fonts referenced by issued
  invoices are hidden, never deleted.
- Size and tracking compensations tuned for the substitutes apply only
  while the face is not overridden; default output and fingerprint
  goldens are unchanged.
- Settings gets a Fonts section with a licence acknowledgement.

Void packaging:
- Install fonts to /usr/share/fonts/voiced with per-family OFL licences,
  set font_dirs, and add INSTALL/REMOVE scripts that run fc-cache.
  xbps-create carries both scripts (verified in a void-glibc container).
- Fix xbps-create dependency specs in build-xbps.sh.

src/pdf/templates/marble/tokens.ts

@@ -18,31 +18,32 @@ export const BAND_TO = "#ECEAEE";
  * Marble's type (docs/templates/01-marble.md): Lustria in tracked caps for the title, headings, table heads and the
  * amount due; "Now" (drawn in Jost, the bundled look-alike) for everything else. Jost sets about 12% narrower than Now,
  * so every Now role carries the tracking that restores the reference widths (0.10 to 0.13 em on top of the design's
- * 0.04 em). Lustria ascent 0.955, descent 0.327; Jost 1.07 / 0.375.
+ * 0.04 em). A real Now imported by the user replaces Jost, so those roles take the design's 0.04 em back through
+ * ownFont. Lustria ascent 0.955, descent 0.327; Jost 1.07 / 0.375.
  */
 export const MARBLE_ROLES = defineRoles({
   /** "INVOICE" / "TAX INVOICE": 25.18 pt, tracked 0.192 em, shrunk to the room the stack has. */
   title: { face: L, weight: 400, size: 25.18, leading: 25.2, tracking: 0.192, caps: true, minSize: 13 },
   /** The vendor's name at the header's left (the design leaves it empty). */
   brand: { face: L, weight: 400, size: 12.65, leading: 18.2, tracking: 0.11, caps: true, minSize: 9 },
-  meta: { face: N, weight: 400, size: 11.55, leading: 17.5, tracking: 0.105, minSize: 8 },
+  meta: { face: N, weight: 400, size: 11.55, leading: 17.5, tracking: 0.105, ownFont: { tracking: 0.04 }, minSize: 8 },
   /** BILL TO:, PAYABLE TO:, SUPPLIER:. */
   heading: { face: L, weight: 400, size: 12.65, leading: 18.2, tracking: 0.11, caps: true },
-  body: { face: N, weight: 400, size: 11.55, leading: 18.2, tracking: 0.105, minSize: 8 },
+  body: { face: N, weight: 400, size: 11.55, leading: 18.2, tracking: 0.105, ownFont: { tracking: 0.04 }, minSize: 8 },
   tableHead: { face: L, weight: 400, size: 11.68, leading: 16, tracking: 0.192, caps: true },
-  tableBody: { face: N, weight: 400, size: 10.57, leading: 17.4, tracking: 0.102 },
-  tableSub: { face: N, weight: 400, size: 8.5, leading: 11.5, tracking: 0.1 },
+  tableBody: { face: N, weight: 400, size: 10.57, leading: 17.4, tracking: 0.102, ownFont: { tracking: 0.04 } },
+  tableSub: { face: N, weight: 400, size: 8.5, leading: 11.5, tracking: 0.1, ownFont: { tracking: 0.04 } },
   totalLabel: { face: L, weight: 400, size: 9, leading: 16, tracking: 0.192, caps: true },
-  totalValue: { face: N, weight: 400, size: 10.57, leading: 16, tracking: 0.102 },
+  totalValue: { face: N, weight: 400, size: 10.57, leading: 16, tracking: 0.102, ownFont: { tracking: 0.04 } },
   /** AMOUNT DUE: 14.6 pt, tracked 0.192 em. */
   due: { face: L, weight: 400, size: 14.6, leading: 20, tracking: 0.192, caps: true, minSize: 10 },
-  small: { face: N, weight: 400, size: 9.6, leading: 15.3, tracking: 0.13 },
+  small: { face: N, weight: 400, size: 9.6, leading: 15.3, tracking: 0.13, ownFont: { tracking: 0.04 } },
   smallLabel: { face: L, weight: 400, size: 9, leading: 15.3, tracking: 0.192, caps: true },
-  signName: { face: N, weight: 400, size: 10.57, leading: 15, tracking: 0.102 },
-  signDesignation: { face: N, weight: 400, size: 9.6, leading: 14, tracking: 0.13 },
-  fine: { face: N, weight: 400, size: 8, leading: 11, tracking: 0.1 },
+  signName: { face: N, weight: 400, size: 10.57, leading: 15, tracking: 0.102, ownFont: { tracking: 0.04 } },
+  signDesignation: { face: N, weight: 400, size: 9.6, leading: 14, tracking: 0.13, ownFont: { tracking: 0.04 } },
+  fine: { face: N, weight: 400, size: 8, leading: 11, tracking: 0.1, ownFont: { tracking: 0.04 } },
   /** The footer band's contact lines. */
-  contact: { face: N, weight: 400, size: 9.6, leading: 15.3, tracking: 0.13, minSize: 7 },
+  contact: { face: N, weight: 400, size: 9.6, leading: 15.3, tracking: 0.13, ownFont: { tracking: 0.04 }, minSize: 7 },
   footer: { face: N, weight: 400, size: 7 },
 });