Rename State of Applicability to Statement of Applicability

Rename the entity across the full stack: database table
(states_of_applicability → statements_of_applicability), Go model,
GraphQL types, MCP specification, CLI commands, frontend components,
routes, and display labels. Includes a migration to rename the table
and its foreign key column.

Widen sidebar from 260px to 280px to fit the longer label.

Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>

packages/ui/src/Atoms/Sidebar/Sidebar.tsx

@@ -47,7 +47,7 @@ export function Sidebar({ children }: PropsWithChildren) {
       <aside
         className={clsx(
           "border-r border-border-solid relative pt-16 flex-none",
-          open ? "px-4 w-[260px]" : "px-2",
+          open ? "px-4 w-[280px]" : "px-2",
         )}
       >
         {children}