Tools: Horizontal and Vertical Type Mask (#1055) (#2861)

The Type flyout (T, Shift+T cycle) gains Vertical Type Mask and Horizontal
Type Mask, in Photoshop's order. They type like the Type tools, with the
canvas under Quick Mask's colour and the glyphs clear while editing. On
commit the glyph coverage replaces the selection; no layer is left behind
and the whole session is one "Type Mask" history step. Escape always
cancels and leaves the selection unchanged.

The commit runs a new engine command, type.createSelection: a type layer's
glyphs (optionally removing that layer, the tools' hidden working text) or
type.create's keys directly, with new/add/subtract/intersect and an
anti-aliasing override. type.create's layer building is shared through
type_cmds::new_text_layer.

Original dashed-T icons (ATTRIBUTION.md), tool label translations in every
catalog, README tool list and the gaps/parity docs updated.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>

assets/icons/type-mask-vertical.svg

@@ -0,0 +1,19 @@
+<svg
+  xmlns="http://www.w3.org/2000/svg"
+  width="24"
+  height="24"
+  viewBox="0 0 24 24"
+  fill="none"
+  stroke="currentColor"
+  stroke-width="2"
+  stroke-linecap="round"
+  stroke-linejoin="round"
+>
+  <!-- PhotoCraft's own Vertical Type Mask glyph (not from an icon set): a T drawn as marching
+       ants beside a downward arrow (the text runs top to bottom). -->
+  <path d="M2.5 7V4h12v3" stroke-dasharray="2.5 2.5" />
+  <path d="M8.5 4v16" stroke-dasharray="2.5 2.5" />
+  <path d="M6 20h5" stroke-dasharray="2.5 2.5" />
+  <path d="M20 8v12" />
+  <path d="M17.5 17.5 20 20l2.5-2.5" />
+</svg>

assets/icons/type-mask.svg

@@ -0,0 +1,16 @@
+<svg
+  xmlns="http://www.w3.org/2000/svg"
+  width="24"
+  height="24"
+  viewBox="0 0 24 24"
+  fill="none"
+  stroke="currentColor"
+  stroke-width="2"
+  stroke-linecap="round"
+  stroke-linejoin="round"
+>
+  <!-- PhotoCraft's own Horizontal Type Mask glyph (not from an icon set): a T drawn as marching ants. -->
+  <path d="M4 7V4h16v3" stroke-dasharray="2.5 2.5" />
+  <path d="M12 4v16" stroke-dasharray="2.5 2.5" />
+  <path d="M8.5 20h7" stroke-dasharray="2.5 2.5" />
+</svg>