Add batch forge per-file skipped counter UI and tests.

Batch fusion now skips preflight/build failures per file, shows skipped count in progress header and log, and documents coverage by removing the deferred PROBLEMS row.

server/web/src/pages/BuilderPage.test.tsx

@@ -611,6 +611,79 @@ describe('BuilderPage', () => {
     expect(screen.getByText(/1\/2 — cancelled/i)).toBeInTheDocument();
   });
 
+  it('skips per-file build failures and shows skipped counter in batch progress', async () => {
+    const user = userEvent.setup();
+    const buildSpy = vi.spyOn(api, 'buildAgent').mockImplementation(async (_req, file) => {
+      if (file?.name === 'bad.pdf') {
+        return { success: false, error: 'Payload too large for fusion stub' };
+      }
+      return successfulBuild({
+        fusion_enabled: true,
+        bundle_file_name: `${file?.name ?? 'file'}-package.zip`,
+        fusion_export_dir: `fusion-deliverables/${file?.name ?? 'file'}`,
+      });
+    });
+    vi.stubGlobal('fetch', vi.fn().mockResolvedValue({
+      ok: true,
+      json: async () => ({ stage: 'Packaging', pct: 90 }),
+    }));
+
+    renderBuilder();
+    await screen.findByRole('heading', { level: 2, name: 'Quick Forge' });
+    await user.click(screen.getByRole('button', { name: /Hide miner in any file/i }));
+
+    fireEvent.change(fusionBatchFileInput(), {
+      target: { files: [mockFusionFile('bad.pdf'), mockFusionFile('good.pdf')] },
+    });
+    await user.click(screen.getByRole('button', { name: /Forge all 2 files/i }));
+
+    await waitFor(() => expect(buildSpy).toHaveBeenCalledTimes(2));
+    expect(await screen.findByText(/Batch forged 1 file\(s\) · 1 skipped/i)).toBeInTheDocument();
+    expect(screen.getByText(/bad\.pdf — Payload too large for fusion stub/i)).toBeInTheDocument();
+    expect(screen.getByText(/2\/2 — done · 1 skipped/i)).toBeInTheDocument();
+    expect(screen.getByText(/good\.pdf — Saved → fusion-deliverables\/good\.pdf/i)).toBeInTheDocument();
+  });
+
+  it('skips per-file preflight failures without aborting the batch', async () => {
+    const user = userEvent.setup();
+    const forgeValidation = await import('../help/forgeValidation');
+    const { runForgePreflight: realPreflight } = await vi.importActual<
+      typeof import('../help/forgeValidation')
+    >('../help/forgeValidation');
+    const preflightSpy = vi.spyOn(forgeValidation, 'runForgePreflight').mockImplementation((form, fusion) => {
+      if (form.fusion_media_base_name === 'blocked.pdf') {
+        return [{ id: 'fusion', level: 'error', message: 'Fusion media exceeds size cap' }];
+      }
+      return realPreflight(form, fusion);
+    });
+    const buildSpy = vi.spyOn(api, 'buildAgent').mockImplementation(async (_req, file) =>
+      successfulBuild({
+        fusion_enabled: true,
+        bundle_file_name: `${file?.name ?? 'file'}-package.zip`,
+        fusion_export_dir: `fusion-deliverables/${file?.name ?? 'file'}`,
+      }),
+    );
+    vi.stubGlobal('fetch', vi.fn().mockResolvedValue({
+      ok: true,
+      json: async () => ({ stage: 'Packaging', pct: 90 }),
+    }));
+
+    renderBuilder();
+    await screen.findByRole('heading', { level: 2, name: 'Quick Forge' });
+    await user.click(screen.getByRole('button', { name: /Hide miner in any file/i }));
+
+    fireEvent.change(fusionBatchFileInput(), {
+      target: { files: [mockFusionFile('blocked.pdf'), mockFusionFile('allowed.pdf')] },
+    });
+    await user.click(screen.getByRole('button', { name: /Forge all 2 files/i }));
+
+    await waitFor(() => expect(buildSpy).toHaveBeenCalledTimes(1));
+    expect(buildSpy.mock.calls[0][1]?.name).toBe('allowed.pdf');
+    expect(await screen.findByText(/blocked\.pdf — Fusion media exceeds size cap/i)).toBeInTheDocument();
+    expect(screen.getByText(/2\/2 — done · 1 skipped/i)).toBeInTheDocument();
+    preflightSpy.mockRestore();
+  });
+
   it('clears fusion batch queue after successful batch forge', async () => {
     const user = userEvent.setup();
     vi.spyOn(api, 'buildAgent').mockImplementation(async (_req, file) =>