CE-WP-0006/0007: Capture view polish, workplans, and UX refinements

- Blob URL stability, scroll centre, strip-only visual guide
- Focus-gated linking, unlink clears overlay, field badge tooltips
- Capture layout (viewer centre), grey guide lines, Add field button
- Workplans CE-WP-0006 (done) and CE-WP-0007 (T01-T09 done, T10-T12 todo)
- Integration tests and viewer-url helpers

tests/integration/app-prd-scenario.dom.test.tsx

@@ -168,14 +168,16 @@ describe("App — PRD scenario steps 1-8 (CE-WP-0002-T09)", () => {
       );
     });
 
-    // The toolbar should appear with the quoted text preview.
-    const toolbar = await screen.findByText(/New annotation/);
-    expect(toolbar).toBeTruthy();
+    // The inline capture form should appear with the quoted text preview.
+    await screen.findByTestId("inline-capture-form");
+    await screen.findByText(/New evidence/);
 
     // Step 4: add a comment and save.
-    const textarea = screen.getByPlaceholderText(/Add a one-line comment/);
-    await user.type(textarea, "Important deadline clause");
-    await user.click(screen.getByRole("button", { name: /Save evidence/ }));
+    await user.type(
+      screen.getByTestId("inline-capture-commentary"),
+      "Important deadline clause",
+    );
+    await user.click(screen.getByTestId("inline-capture-save"));
 
     // Step 5: the item appears in the sidebar. The commentary text is
     // unique to the right pane (the collection list never echoes it back).