fix(maestro): fix diff double-spacing and add +/- markers

Block spans + literal \n text nodes inside <pre> caused empty lines
between every diff line. Drop the text nodes, add unified-diff prefixes.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/structured.ts

@@ -85,10 +85,10 @@ export function createStructuredConnection(
       <div class="structured-main">
         <div class="structured-scroll">
           <div class="structured-rows"></div>
-        </div>
-        <div class="structured-activity" role="status" aria-live="polite" hidden>
-          <span class="structured-activity-pulse" aria-hidden="true"></span>
-          <span class="structured-activity-text">Thinking</span>
+          <div class="structured-activity" role="status" aria-live="polite" hidden>
+            <span class="structured-activity-pulse" aria-hidden="true"></span>
+            <span class="structured-activity-text">Thinking</span>
+          </div>
         </div>
         <form class="structured-composer">
           <button type="button" class="btn btn-ghost btn-icon structured-attach" aria-label="Attach files" title="Attach files (up to 20 MiB each)">
@@ -717,6 +717,7 @@ export function createStructuredConnection(
 
   function renderActivity(): void {
     const active = state.turn.responding || state.turn.thinking || awaitingBeginGeneration !== null;
+    const wasHidden = activityEl.hidden;
     activityEl.hidden = !active;
     if (!active) {
       optimisticTurnStartedAt = null;
@@ -739,6 +740,11 @@ export function createStructuredConnection(
     }
     activityText.textContent = parts.join(" · ");
     if (activityTimer === null) activityTimer = window.setInterval(renderActivity, 1_000);
+    // Activity lives inside the scroll area; nudge scroll when it first appears.
+    if (wasHidden && followingBottom) {
+      beginTranscriptLayout(true);
+      finishTranscriptLayout();
+    }
   }
 
   function reconcileAwaitingBegin(): void {

web/src/structuredRender.test.ts

@@ -315,8 +315,8 @@ describe("buildTranscriptRow: tool diffs", () => {
     (el.querySelector(".st-tool-head") as HTMLButtonElement).click();
     const diff = el.querySelector(".st-diff") as HTMLElement;
     expect(diff).not.toBeNull();
-    expect(diff.querySelector(".st-ln-add")!.textContent).toBe("c");
-    expect(diff.querySelector(".st-ln-del")!.textContent).toBe("b");
+    expect(diff.querySelector(".st-ln-add")!.textContent).toBe("+ c");
+    expect(diff.querySelector(".st-ln-del")!.textContent).toBe("- b");
   });
 
   it("gives the diff its own horizontally-scrolling container", () => {

web/src/structuredRender.ts

@@ -223,15 +223,16 @@ function buildDiffBlock(diff: { path: string; oldText?: string | null; newText:
   wrap.appendChild(label);
   const scroller = el("div", "st-diff");
   const pre = document.createElement("pre");
-  for (const line of computeDiffLines(diff.oldText, diff.newText)) {
+  const lines = computeDiffLines(diff.oldText, diff.newText);
+  const prefixes: Record<string, string> = { add: "+ ", del: "- ", ctx: "  ", hunk: "", eof: "" };
+  for (const line of lines) {
     const span = document.createElement("span");
     span.className = `st-ln st-ln-${line.kind}`;
-    span.textContent = line.text;
+    span.textContent = (prefixes[line.kind] ?? "") + line.text;
     pre.appendChild(span);
-    pre.appendChild(document.createTextNode("\n"));
   }
   scroller.appendChild(pre);
-  makeCopyable(scroller, pre.textContent ?? "", "diff");
+  makeCopyable(scroller, lines.map((l) => (prefixes[l.kind] ?? "") + l.text).join("\n"), "diff");
   wrap.appendChild(scroller);
   return wrap;
 }

web/src/styles.css

@@ -2318,9 +2318,7 @@ input.leaf-rename:focus {
   gap: var(--sp-2);
   min-height: 30px;
   padding: var(--sp-1) var(--sp-3);
-  border-top: 1px solid var(--border);
   color: var(--muted);
-  background: var(--surface-2);
   font-size: var(--fs-11);
   font-variant-numeric: tabular-nums;
 }
@@ -2967,6 +2965,7 @@ input.leaf-rename:focus {
   display: block;
   white-space: pre;
   padding: 0 var(--sp-3);
+  line-height: 1.4;
 }
 
 .st-ln-add {