fix: validate blank message submission / 修复空消息提交校验

[tiye]

English

Follow-up to #33: blank composer submissions could still reset the chat and enter Streaming before validation, while the prompt validator returned a non-string success value under the current alerts contract.

• return an empty String from the Reply prompt validator success path;
• validate blank text before API-key lookup and before any Store mutation;
• show an alerts-based “Please enter text” message;
• keep the existing chat/session state unchanged for invalid input.

中文

这是 #33 的后续修复：空白输入仍会在校验前重置聊天并进入 Streaming，同时 Reply prompt validator 的成功分支在新版 alerts 契约下返回了非字符串值。

• Reply prompt validator 的成功分支返回空字符串；
• 在 API key 查询及任何 Store 修改之前校验空白文本；
• 通过 alerts 显示 “Please enter text”；
• 非法输入时保持现有聊天/会话状态不变。

Validation / 验证

• calcit edit format
• calcit --check-only
• calcit js
• msg-buffer config module resolved to the local Respo checkout, then check/codegen passed / 通过 msg-buffer config module 指向本地 Respo 后检查与编译通过
• clean browser smoke on 127.0.0.1:5182: blank Submit shows the alert, does not enter Streaming, and logs no runtime error / 干净浏览器环境验证空提交只显示提示、不进入 Streaming、无运行时错误

[Copilot]

🟢 Approval recommended

The changes correctly block blank submissions before any API-key lookup and prevent unintended state transitions while matching the alerts validator contract (string return).

Pull request overview

Addresses a follow-up validation gap where blank submissions could still transition the chat into a “Streaming” flow (and mutate state) before input validation, and aligns the Reply prompt validator with the updated alerts contract by returning a string on success.

Changes:

• Make the Reply prompt validator return an empty string on success (and an error string on blank input).
• Add an alerts-based “Please enter text” alert and short-circuit blank submissions before API-key lookup / message submission.
• Ensure invalid (blank) input does not reset chat/session state or trigger streaming.

File summaries

File	Description
calcit.cirru	Updates prompt validation and submit flow to block blank submissions early and display an alerts-based “Please enter text” without mutating chat/session state.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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