FX.16 TakeoffCraft: areas in m² on the drawing, wall area in the tables, currency symbol

Reported on lab pass 18 (TK.1) by a Greek tester: (1) an area measured with a metric item showed m² in the table but 'SF' in the drawing label and the mark panel. Now one areaShow() writes m² when the item is priced in metric or lengths show metric (m/cm/mm), else SF; used for the drawing tag, the mark panel (area, back-outs, plan area, outline, cut-outs, wall area). (2) A linear item with a height only showed its wall area in the item editor; the Items list now ends 'wall 12.34 m²' and the by-item quantities table gets a note row under it (length × height). Tiling a bathroom: floor = an area item in m², walls = a linear item with the wall height (or an assembly component with formula A priced per m²). Not built: one combined floor + walls total, or pricing a linear item per m² directly. (3) New Settings › TakeoffCraft › Currency symbol ($ € £ CHF kr zł R A$ C$): prices, bid PDF, CSV/XLSX number formats. Display only, nothing converted, per viewer (not saved in the project file). Existing suite 1196 pass; no new test, not tried in a browser; other languages show English for the new strings.