feat : add copy finding ID action

frontend/src/pages/Findings.tsx

@@ -468,7 +468,21 @@ export default function Findings() {
       setCopiedFindingId(null)
     }
   }
+  async function copyFindingId(findingId: string) {
+  try {
+    await navigator.clipboard.writeText(findingId)
 
+    setCopiedFindingId(findingId)
+
+    window.setTimeout(() => {
+      setCopiedFindingId((current) =>
+        current === findingId ? null : current
+      )
+    }, 1600)
+  } catch {
+    setCopiedFindingId(null)
+  }
+}
   // ─── Keyboard navigation ────────────────────────────────────────────────────
   const listRef = useRef<HTMLDivElement>(null)
 
@@ -940,9 +954,20 @@ export default function Findings() {
                     </div>
 
                     <div>
-                      <p className="mb-2 text-[10px] font-black uppercase tracking-[0.2em] text-silver/35">Selected Finding</p>
-                      <h2 className="text-3xl font-black uppercase italic tracking-tight text-silver-bright">{selectedFinding.title}</h2>
-                    </div>
+  <p className="mb-2 text-[10px] font-black uppercase tracking-[0.2em] text-silver/35">
+    Selected Finding
+  </p>
+
+  <h2 className="text-3xl font-black uppercase italic tracking-tight text-silver-bright">
+    {selectedFinding.title}
+  </h2>
+
+  <div className="mt-3 flex items-center gap-2">
+    <span className="text-xs font-mono text-silver/60">
+      ID: {selectedFinding.id}
+    </span>
+  </div>
+</div>
 
                     <div className="grid gap-3 sm:grid-cols-2">
                       <div className="border border-silver-bright/8 bg-charcoal-dark p-3">
@@ -1133,6 +1158,13 @@ export default function Findings() {
                       >
                         {copiedFindingId === selectedFinding.id ? 'Copied' : 'Copy Brief'}
                       </button>
+                      <button
+                        type="button"
+                        onClick={() => copyFindingId(selectedFinding.id)}
+                        className="border border-rag-green/25 bg-rag-green/10 px-4 py-3 text-[10px] font-black uppercase tracking-[0.18em] text-rag-green"
+                      >
+                        {copiedFindingId === selectedFinding.id ? 'Copied' : 'Copy ID'}
+                      </button>
                     </div>
                   </div>
                 </div>

frontend/testing/unit/pages/Findings.test.tsx

@@ -231,6 +231,42 @@ describe('Findings — virtualized list', () => {
     })
   })
 
+  it('copies finding id and shows success feedback', async () => {
+    const findings = [makeFinding({ id: 'f1', title: 'ID Copy Test' })]
+    vi.mocked(getFindings).mockResolvedValue({ findings })
+    Object.defineProperty(navigator, 'clipboard', {
+      configurable: true,
+      value: { writeText: vi.fn().mockResolvedValue(undefined) },
+    })
+
+    render(<Findings />)
+    await waitFor(() => expect(screen.queryByText('Synchronizing findings feed...')).not.toBeInTheDocument())
+
+    const copyButton = screen.getByRole('button', { name: /Copy ID/i })
+    await userEvent.click(copyButton)
+
+    await waitFor(() => expect(navigator.clipboard.writeText).toHaveBeenCalledWith('f1'))
+    expect(copyButton).toHaveTextContent('Copied')
+  })
+
+  it('keeps copy state idle when finding id copy fails', async () => {
+    const findings = [makeFinding({ id: 'f2', title: 'ID Copy Failure Test' })]
+    vi.mocked(getFindings).mockResolvedValue({ findings })
+    Object.defineProperty(navigator, 'clipboard', {
+      configurable: true,
+      value: { writeText: vi.fn().mockRejectedValue(new Error('clipboard unavailable')) },
+    })
+
+    render(<Findings />)
+    await waitFor(() => expect(screen.queryByText('Synchronizing findings feed...')).not.toBeInTheDocument())
+
+    const copyButton = screen.getByRole('button', { name: /Copy ID/i })
+    await userEvent.click(copyButton)
+
+    await waitFor(() => expect(navigator.clipboard.writeText).toHaveBeenCalledWith('f2'))
+    expect(copyButton).toHaveTextContent('Copy ID')
+  })
+
   it('persists review state to localStorage', async () => {
     const findings = [makeFinding({ id: 'f1', title: 'Persist Test', severity: 'high' })]
     vi.mocked(getFindings).mockResolvedValue({ findings })