Per organized-ideas.md §8: the storage layer (DiagramRepository etc.) was
already renamed in an earlier phase; this finishes it everywhere else.
- domain/types.ts: Project -> Diagram. domain/project.ts -> domain/diagram.ts
(createEmptyProject -> createEmptyDiagram, default name "Untitled Diagram").
- domain/compatibility.ts, domain/bom.ts: Project param/type -> Diagram.
- data/exportImport.ts: ProjectImportError -> DiagramImportError,
projectToJson/downloadProjectFile/readProjectFile/normalizeProject -> their
Diagram equivalents.
- state/projectStore.ts -> state/diagramStore.ts: useProjectStore ->
useDiagramStore, the `project` field -> `diagram`, newProject/renameProject/
importProject/applyRestoredProject -> *Diagram, restoredProjectUpdatedAt ->
restoredDiagramUpdatedAt.
- Every component updated to match, compiler-guided (tsc -b enumerated each
remaining call site after the core rename, the same approach used for the
earlier catalog-parameter refactor).
- README updated for the terminology, and to match the repository class
names (which had already been renamed but the README hadn't caught up).
No backend/schema changes: the JSON shape stored in diagrams.data never
changed, only TypeScript-side identifiers, so existing diagrams are
unaffected. One SQL comment fixed for accuracy (no migration needed).
Verified: tsc -b and oxlint clean; grepped src/ for any remaining
Project/project reference (none) after the sweep.
aarbit