feat(agent): add addressable queue operations

apps/web/tests/snapshots/queue-actions/editing.expected.md

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+- banner:
+  - navigation "Session hierarchy":
+    - button "Reply with a one-sentence description" [disabled]
+  - tablist:
+    - tab "Chat" [selected]
+    - tab "Trajectory"
+    - tab "Waterfall"
+- text: Reply with a one-sentence description of event sourcing, then stop. {{clock}}
+- button "复制":
+  - img
+- button "在新对话中分支":
+  - img
+- button "编辑":
+  - img
+- paragraph: partial
+- list:
+  - listitem:
+    - text: Queue item to remove
+    - button "编辑排队消息":
+      - img
+    - button "删除排队消息":
+      - img
+  - listitem:
+    - textbox "编辑排队消息": Edited queue item
+    - button "保存排队消息":
+      - img
+    - button "取消编辑":
+      - img
+- textbox "Message the agent"
+- button "Add attachment":
+  - img
+- text: Danger Full Access
+- combobox "Access mode":
+  - 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 "Stop generating"

apps/web/tests/snapshots/queue-actions/ui.expected.md

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+- banner:
+  - navigation "Session hierarchy":
+    - button "Reply with a one-sentence description" [disabled]
+  - tablist:
+    - tab "Chat" [selected]
+    - tab "Trajectory"
+    - tab "Waterfall"
+- text: Reply with a one-sentence description of event sourcing, then stop. {{clock}}
+- button "复制":
+  - img
+- button "在新对话中分支":
+  - img
+- button "编辑":
+  - img
+- paragraph: partial
+- list:
+  - listitem:
+    - text: Edited queue item
+    - button "编辑排队消息":
+      - img
+    - button "删除排队消息":
+      - img
+- textbox "Message the agent"
+- button "Add attachment":
+  - img
+- text: Danger Full Access
+- combobox "Access mode":
+  - 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 "Stop generating"