Module tree 

Full-screen upgrade-tree modal renderer.

Layout (top to bottom):

• Header (3 rows): title, cuques, cursor coord, owned count.
• Canvas (variable): the pannable infinite tree, centered on the cursor.
• Info pane (8 rows): focused node’s title + primitives + cost + action hints.

Bottom help_height rows (the help bar ui::mod.rs draws first) are intentionally left untouched.

Coordinate spaces:

• lot (lx, ly): integer coords on the infinite tree grid.
• canvas (cx, cy): cell coords on the same infinite grid where boxes live (each lot occupies LOT_W × LOT_H cells).
• screen (sx, sy): actual terminal cell coords.

Conversion: screen = canvas - pan + canvas_origin.

Structs

TreeDrawOutput

Tree-modal renderer output. Carries the same per-node click rects the modal has always exposed, plus an optional clickable action button (Buy or Refund) for the focused node — that’s the left-click target for touch / single-button players.

Functions

draw