Chat input '+' (Add attachment) button does nothing — attachment feature unimplemented

[yikkuro]

Summary

The "+" button in the chat input box (rendered with an "Add attachment" tooltip) does nothing when clicked. The attachment feature is unimplemented — only the button shell exists.

Details

The button appears in both input states in desktop/renderer/src/views/ChatView.vue:

• empty/home state — line 64
• in-chat state — line 149

<button class="home-input-plus" :title="t('chat.addAttachment')">
  <svg ...><line .../><line .../></svg>  <!-- plus icon -->
</button>

Both buttons have no @click handler, so clicking is a no-op.

A codebase-wide search across desktop/renderer/src confirms there is no attachment logic at all:

• no hidden <input type="file">
• no file picker / drag-and-drop handler
• no attach/upload handler
• no attachment support in the chat send flow

The only references anywhere are the two buttons above and the two i18n strings:

• desktop/renderer/src/i18n/en-US.ts:105 → "chat.addAttachment": "Add attachment"
• desktop/renderer/src/i18n/zh-CN.ts:100 → "chat.addAttachment": "添加附件"

Expected

Either:

1. Implement file attachment (open a file picker, attach to the outgoing message), or
2. Remove/hide the placeholder button until the feature is built, so users aren't misled by a dead control.

Impact

Minor/UX: users click the button expecting to add an attachment and nothing happens, with no feedback.