增强文档改写配图与深度研究流式稳定性，并完善 8BF/会商工作区。

全文改写支持可选配图与思考过程展示，深度研究接入 DashScope 原生出图并剥离内联 think 标签；8BF 会商补齐第一步工作区与任务卡回退，同时限制热重载扫描范围。

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend-web/src/core/streamdown/inline-think.ts

@@ -0,0 +1,90 @@
+/**
+ * Some OpenAI-compatible reasoning models write ``<think>...</think>`` into
+ * the ordinary text stream rather than a dedicated reasoning field.  Markdown
+ * sandboxes must never render those fragments as document content.  Callers
+ * can separately render the returned thinking part in a labelled UI trace.
+ *
+ * The filter is stateful because either tag can be split across arbitrary SSE
+ * deltas.  Hold only a possible tag suffix, so confirmed Markdown continues
+ * to appear with the normal token-streaming cadence.
+ */
+export class InlineThinkTagFilter {
+  private static readonly OPEN_TAG = "<think>";
+  private static readonly CLOSE_TAG = "</think>";
+
+  private insideThink = false;
+  private pending = "";
+
+  private possibleTagPrefixSize(content: string, tag: string) {
+    const lowered = content.toLowerCase();
+    for (let size = Math.min(content.length, tag.length - 1); size > 0; size -= 1) {
+      if (lowered.slice(-size) === tag.slice(0, size)) return size;
+    }
+    return 0;
+  }
+
+  pushParts(chunk: string): { text: string; thinking: string } {
+    if (!chunk) return { text: "", thinking: "" };
+
+    let remaining = this.pending + chunk;
+    this.pending = "";
+    let visible = "";
+    let thinking = "";
+
+    while (remaining) {
+      const tag = this.insideThink
+        ? InlineThinkTagFilter.CLOSE_TAG
+        : InlineThinkTagFilter.OPEN_TAG;
+      const tagIndex = remaining.toLowerCase().indexOf(tag);
+      if (tagIndex >= 0) {
+        if (this.insideThink) thinking += remaining.slice(0, tagIndex);
+        else visible += remaining.slice(0, tagIndex);
+        remaining = remaining.slice(tagIndex + tag.length);
+        this.insideThink = !this.insideThink;
+        continue;
+      }
+
+      const suffixSize = this.possibleTagPrefixSize(remaining, tag);
+      const confirmed = suffixSize ? remaining.slice(0, -suffixSize) : remaining;
+      if (this.insideThink) thinking += confirmed;
+      else visible += confirmed;
+      this.pending = suffixSize ? remaining.slice(-suffixSize) : "";
+      break;
+    }
+
+    return { text: visible, thinking };
+  }
+
+  push(chunk: string) {
+    return this.pushParts(chunk).text;
+  }
+
+  /** Flush a completed stream into its visible/thinking channels. */
+  finishParts(): { text: string; thinking: string } {
+    if (this.insideThink) {
+      const thinking = this.pending;
+      this.insideThink = false;
+      this.pending = "";
+      return { text: "", thinking };
+    }
+    const tail = this.pending;
+    this.pending = "";
+    return { text: tail, thinking: "" };
+  }
+
+  finish() {
+    return this.finishParts().text;
+  }
+
+  /** Replace a rendered checkpoint while retaining the correct tag state. */
+  replace(content: string) {
+    this.insideThink = false;
+    this.pending = "";
+    return this.push(content);
+  }
+}
+
+export function stripInlineThinkTags(content: string) {
+  const filter = new InlineThinkTagFilter();
+  return filter.push(content) + filter.finish();
+}