fix(report): show bare repo name in top-repos-by-severity bars

Every repo in scope shares the scan target's owner, so the prefix is noise in these bars. Strip it for the visible label via a new format/repo.ts helper; the full owner/name stays in the hover tooltip and the methodology appendix.

Author: blimmer

src/report/web/App.browser.test.tsx

@@ -148,12 +148,12 @@ describe('App report shell', () => {
     });
 
     const table = screen.getByTestId(riskStoryTestIds.topReposTable);
-    expect(within(table).getByText('acme/repo-5')).toBeInTheDocument();
-    expect(within(table).queryByText('acme/repo-6')).not.toBeInTheDocument();
+    expect(within(table).getByText('repo-5')).toBeInTheDocument();
+    expect(within(table).queryByText('repo-6')).not.toBeInTheDocument();
 
     fireEvent.click(screen.getByTestId(riskStoryTestIds.topReposToggle));
 
-    expect(within(table).getByText('acme/repo-6')).toBeInTheDocument();
+    expect(within(table).getByText('repo-6')).toBeInTheDocument();
     expect(screen.getByTestId(riskStoryTestIds.topReposToggle)).toHaveTextContent('Show top 5');
   });
 

src/report/web/acts/RiskStory.tsx

@@ -1,5 +1,6 @@
 import { useState } from 'react';
 import { useEmbeddedData } from '../data/EmbeddedDataContext.tsx';
+import { repoShortName } from '../format/repo.ts';
 import { useAssumptionsDisclosure } from '../hooks/useAssumptionsDisclosure.tsx';
 import { Citation } from '../primitives/Citation.tsx';
 import { SEGMENTS, StackedBar } from '../primitives/StackedBar.tsx';
@@ -193,7 +194,7 @@ function RepoSeverityBar({ repo, maxTotal }: { repo: RepoSeverityRow; maxTotal:
   return (
     <div className="grid grid-cols-[minmax(0,10rem)_1fr_2.5rem] items-center gap-3 text-sm">
       <div className="text-foreground truncate font-mono text-xs" title={repo.repo}>
-        {repo.repo}
+        {repoShortName(repo.repo)}
       </div>
       <div className="bg-muted h-3.5 overflow-hidden rounded-full">
         <div className="flex h-full" style={{ width: `${(total / maxTotal) * 100}%` }}>

src/report/web/format/repo.ts

@@ -0,0 +1,3 @@
+export function repoShortName(repo: string): string {
+  return repo.slice(repo.lastIndexOf('/') + 1);
+}