The dashboard's layout lived in localStorage as `{id, visible}` — a visibility
toggle wearing a layout's clothes. It carried no geometry, so widget width was
baked into SCSS (`.dash-kpi { grid-column: span 3 }`) and "make the chart wider"
was a code change. And it stayed on one machine.
`DashboardBoard` gives a user real boards: named, ordered, each holding a JSON
array of placed widgets with x/y/w/h and per-instance config. Three defaults
ship — overview, infrastructure, apps & deploys — seeded on a user's first GET
and restorable per board.
Validation is deliberate about the boring cases: geometry must fit the 12-column
grid, ids must be unique within a board, bools are rejected as coordinates
(`bool` subclasses `int`), and a rejected PUT leaves the stored board untouched
rather than half-applied. A board belonging to another user is a 404, not a 403
— there is no reason to confirm it exists.
The shipped defaults are checked by rebuilding their occupancy map cell by cell,
so editing DEFAULT_BOARDS into an overlap fails the suite instead of shipping a
broken first-run layout.
31 tests.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
