M7: area type vertical alignment

Area Type Options > Align: Top / Center / Bottom / Justify (AreaOptions.verticalAlign,
LayoutOptions.vertical_align). Each row/column cell is aligned on its own; rectangular
cells shift their lines, other frames and text wrap reflow until settled without
losing text. Justify shares the leftover space equally between line gaps. Area Type Options
shows Align and First Baseline as dropdowns (the parameter dialog's choices table).

docs/mcp.md

@@ -2201,6 +2201,22 @@ undo step. Object › Transform › Scale, the Scale tool and the Transform pane
 {"name":"run_command","arguments":{"command":"text.reshapeArea","params":{"id":42,"anchors":[[0,2]],"dx":40,"dy":60}}}
 ```
 
+### Vertical alignment
+
+`text.areaOptions {verticalAlign: top|center|bottom|justify}` (Area Type Options › Align) places the lines of each
+row/column cell on its own: `center` centres the block of lines in the cell, `bottom` puts the last line's descent on
+the cell's bottom (inside the inset), `justify` keeps the first line at the top, moves the last one to the bottom and
+shares the space left over equally between the lines (there is no paragraph spacing limit: every line gap grows by
+the same amount). A cell with a single line justifies to the top, and a full or overflowing cell only moves by the
+less-than-a-line of space it has left. In rectangular frames without text wrap the lines just move; in other
+frames (and around wrap objects) the text flows again starting lower until it settles, never losing text that fit
+top-aligned. Vertical type aligns along its block axis (`bottom` is the frame's left edge). Exports lay type out
+again, so SVG, PDF and EPS show the aligned text.
+
+```json
+{"name":"run_command","arguments":{"command":"text.areaOptions","params":{"verticalAlign":"center"}}}
+```
+
 ## Converting between point type and area type
 
 With the Selection tool, a single selected point or area type object shows the type widget: a small circle beside