fix(home): Current Coverage KPI shows too many decimal places, can overflow box #978

Bug report

QA row 557 — Home Page, step 1.1

Action: Load the Home page and observe the "Current Coverage" KPI tile.

Actual: The coverage value is rendered as a raw float (e.g. 72.3456789012%) with no decimal-place limit. At some screen resolutions this overflows the KPI tile box.

Expected: Coverage should be rounded to a fixed precision (1 decimal place, matching the formatting used for coverage percentages throughout the app, e.g. 72.3%).

Note: Only display formatting is affected; the underlying data value must not be changed. Sibling percentages in inventory.ts use .toFixed(1) — the Home KPI should match.