test(web): answer the fixture approval takeover; refresh aria goldens

The assembled fixture app now takes over the composer while fx-alpha's
resident approval is pending — the feature under test, not chrome noise —
so the session-title snapshot answers it (允许一次) before asserting the
model seat, mirroring what a user sees. The eleven keyless ui.expected.md
goldens re-record (DSH_SNAPSHOT=refresh, no key) for the Access placeholder
→ projection chip swap (Danger Full Access under the roster default) plus
the master-side chrome drift the goldens had accumulated (copy/branch/edit
buttons, tab rows) since their last refresh.

apps/web/tests/snapshots/live-interactions/error-auth.expected.md

@@ -1,19 +1,26 @@
 - banner:
   - navigation "Session hierarchy":
     - button "Reply with a one-sentence description" [disabled]
-    - text: · 1 turns
   - tablist:
     - tab "Chat" [selected]
     - tab "Trajectory"
     - tab "Waterfall"
 - text: Reply with a one-sentence description of event sourcing, then stop.
+- button "复制":
+  - img
+- button "在新对话中分支":
+  - img
+- button "编辑":
+  - img
 - textbox "Message the agent"
 - button "Add attachment":
   - img
+- text: Danger Full Access
 - combobox "Access mode":
-  - option "Read-only" [selected]
-  - option "Read-write"
-- button "选择模型，当前 deepseek-v4-flash":
-  - text: deepseek-v4-flash
+  - option "Read Only"
+  - option "Workspace Write"
+  - option "Danger Full Access" [selected]
+- button "选择模型，当前 DeepSeek-V4-Flash":
+  - text: DeepSeek-V4-Flash
   - img
 - button "Send message" [disabled]