fix(editor): area readouts + generated names follow the unit toggle; bump lingo to 0.2.0

[Aymericr]

Follow-up to #472. Two small, targeted changes.

1. Unit-label consistency (fix)

#472 made every length input honor the metric/imperial preference. This closes the two remaining area surfaces that were still hardcoded to m²:

• Load-build import dialog — the "Floor area" stat (formatFloorArea) now converts value + label to the active unit.
• Auto-generated default names for zones, slabs, and ceilings (e.g. Zone (12.3m²)). These are live display fallbacks ({name || defaultName}, recomputed each render), so they now live-update on toggle — Zone (129.2ft²) in imperial.

Adds shared squareMetersToAreaUnit / getAreaUnitLabel / formatAreaLabel helpers to lib/measurements (with tests), and routes the existing site-panel Area readout through them (replacing an inline 10.7639… magic constant).

Audited the full UI: all other length/area readouts (site-panel perimeter + vertices, floorplan 2D area + linear dimension labels) were already unit-aware.

2. Bump @pascal-app/lingo 0.1.0 → 0.2.0 (chore)

API-compatible with our usage (parseQuantity, quantity, Kind). 0.2.0 only adds i18n/locale entrypoints; no imported symbols changed.

Verification

• @pascal-app/editor + @pascal-app/mcp typecheck ✅
• All 31 measurement tests pass, including the AMBIGUOUS_NUMBER → error escalate guard ✅

🤖 Generated with Claude Code

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Note

Low Risk
Display-only formatting and a minor dependency bump; no auth, persistence, or geometry logic changes.

Overview
Extends the metric/imperial preference to area surfaces that were still fixed to m², building on length-input work from #472.

New helpers in lib/measurements — squareMetersToAreaUnit, getAreaUnitLabel, and formatAreaLabel (with tests) — centralize conversion and labeling. The load-build dialog’s floor-area stat, the site panel property-line area readout (replacing an inline conversion constant), and auto-generated default names for zones, slabs, and ceilings now read useViewer’s unit, so values and labels update when the toggle changes.

Also bumps @pascal-app/lingo from 0.1.0 to 0.2.0 in packages/editor, packages/mcp, and the lockfile.

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