refactor(skill): 主技能 subskill 目录更名 subskills（09-02 用户要求）

- V1.0/subskill/ → V1.0/subskills/（browser-harness/mcn-dou-analysis/mcn-script-review/mcn-video-prompt，git 识别 R100 纯重命名保留历史）
- 路径说明同步：V1.0/SKILL.md（96/105行）、Lite1.0/SKILL.md（66行）、mcn-dou-analysis/SKILL.md 红线行、操作规范.md 159/175行、mcn-work-shop app.js SKILL_HINT_ACCOUNT
- 用户环境 ~/.workbuddy/skills/短视频脚本创作/ 与源仓库 V1.0 同 inode（junction），自动同步无需单独改
- mcn-dou-analysis 内部 subskills/nuwa-skill-main 为正常结构不受影响

project/短视频脚本创作/V1.0/subskills/browser-harness/interaction-skills/dialogs.md

@@ -0,0 +1,64 @@
+# Dialogs
+
+Browser dialogs (`alert`, `confirm`, `prompt`, `beforeunload`) freeze the JS thread. Two approaches depending on timing.
+
+## Detection
+
+`page_info()` auto-surfaces any open dialog: if one is pending it returns `{"dialog": {"type", "message", ...}}` instead of the usual viewport dict (because the page's JS is frozen anyway). So if you call `page_info()` after an action and see a `dialog` key, handle it before doing anything else.
+
+## Reactive: dismiss via CDP (preferred)
+
+Works even when JS is frozen. Handles all dialog types including `beforeunload`.
+
+```python
+# Dismiss and read the message
+cdp("Page.handleJavaScriptDialog", accept=True)   # accept / click OK
+cdp("Page.handleJavaScriptDialog", accept=False)  # cancel / click Cancel
+
+# Read what the dialog said (from buffered CDP events)
+events = drain_events()
+for e in events:
+    if e["method"] == "Page.javascriptDialogOpening":
+        print(e["params"]["type"])     # "alert", "confirm", "prompt", "beforeunload"
+        print(e["params"]["message"])  # the dialog text
+```
+
+Undetectable by antibot — no JS injected into the page.
+
+## Proactive: stub via JS
+
+Prevents dialogs from ever appearing. Good when you expect multiple `alert()`/`confirm()` calls in sequence.
+
+```python
+js("""
+window.__dialogs__=[];
+window.alert=m=>window.__dialogs__.push(String(m));
+window.confirm=m=>{window.__dialogs__.push(String(m));return true;};
+window.prompt=(m,d)=>{window.__dialogs__.push(String(m));return d||'';};
+""")
+# ... do actions that trigger dialogs ...
+msgs = js("window.__dialogs__||[]")
+```
+
+Tradeoffs:
+- Stubs are lost on page navigation -- must re-run the snippet
+- `confirm()` always returns `true` (auto-approves)
+- Detectable by antibot (`window.alert.toString()` reveals non-native code)
+- Does NOT handle `beforeunload`
+
+## beforeunload specifically
+
+Fires when navigating away from a page with unsaved changes (forms, editors, upload pages). The page freezes until the user clicks Leave/Stay.
+
+```python
+# Option A: dismiss after navigating (CDP-level, safe)
+goto_url("https://new-url.com")
+try:
+    cdp("Page.handleJavaScriptDialog", accept=True)  # click "Leave"
+except:
+    pass  # no dialog — normal
+
+# Option B: prevent before navigating (JS injection, detectable)
+js("window.onbeforeunload=null")
+goto_url("https://new-url.com")
+```