Polish every product workflow across desktop and mobile

Reframe each screen around the decisions compute brokers make: sellable capacity, full-cost margin, pipeline movement, contract deadlines, evidence review, staged imports, and controlled agent access. Group the shell by operating domain, strengthen mobile navigation and sheets, add responsive record treatments, and make loading, error, empty, readiness, and retry states explicit.

The visual audit exposed sortable table targets and an unnamed file input only after exercising the rendered app, so this commit also pins those accessibility decisions at their actual interaction boundaries. Manrope is self-hosted as a single Latin variable subset to keep the stronger hierarchy without shipping unused font payloads.

apps/web/src/pages/Imports.tsx

@@ -133,7 +133,7 @@ export function Imports() {
     <div className="flex flex-col gap-5">
       <header>
         <h1 className="text-xl font-semibold tracking-tight sm:text-2xl">Import data</h1>
-        <p className="mt-1 max-w-2xl text-sm text-muted">Map a CSV or Excel table into PIG, inspect every create or update, then commit the reviewed plan atomically.</p>
+        <p className="mt-1 max-w-2xl text-sm text-muted">Stage source data, inspect every create or update, then commit the reviewed plan atomically. Nothing writes to PIG before review.</p>
       </header>
 
       <div className="grid gap-3 sm:grid-cols-2 xl:grid-cols-4">
@@ -185,6 +185,7 @@ export function Imports() {
             <div className="space-y-3">
               <Input
                 type="file"
+                aria-label={`Choose ${definition.label.toLocaleLowerCase()} import file`}
                 accept=".csv,.xlsx,text/csv,application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
                 disabled={!allowed || parse.isPending}
                 onChange={(event) => {