fix(web): preserve selected text when copying over HTTP

[yicun]

Related Issue

No tracking issue — the regression was reported through user feedback; the problem is described below.

Problem

Since #1714 (v0.27.0), copying selected chat text over plain HTTP replaces the clipboard contents with [object ClipboardEvent] instead of the selected text.

Root cause chain:

1. fix(web): make code block copy work over plain HTTP #1714 added @copy="copyCodeBlockFallback" to <MarkdownRender> so code-block copy keeps working over plain HTTP, where navigator.clipboard is unavailable.
2. markstream-vue's NodeRenderer forwards onCopy to every block-level child, but ParagraphNode and InlineCodeNode do not declare emits: ["copy"]. Vue 3 attrs fallthrough therefore registers onCopy as a native DOM copy listener on the <p> root element.
3. When the user copies selected text inside a paragraph, the native ClipboardEvent is intercepted by that listener and re-emitted up the tree as the component copy event, so the fallback handler receives the event object instead of a code string.
4. Over HTTPS this is harmless because the fallback early-returns when navigator.clipboard.writeText exists. Over plain HTTP it falls through to the legacy <textarea> + execCommand path, where assigning the event to textarea.value stringifies it to "[object ClipboardEvent]" and overwrites the user's real selection.

This matches the reports: inline code reproduces consistently (it always lives inside a <p>), while headings/lists/tables declare emits and are unaffected; Thinking blocks are unaffected because they are not rendered through markstream.

What changed

• Moved the plain-HTTP fallback from Markdown.vue into clipboard.ts as copyCodeBlockFallback(payload: unknown).
• Non-string payloads (the bubbled native ClipboardEvent) are discarded, so the browser's default selection copy proceeds untouched; genuine code-block copy emits (strings) still get the legacy fallback.
• Added regression tests covering both cases over plain HTTP.

The durable fix belongs upstream (markstream-vue should declare emits: ["copy"] on ParagraphNode / InlineCodeNode); this PR stops the clipboard clobbering in the meantime.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

🦋 Changeset detected

Latest commit: 002aaf5

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@moonshot-ai/kimi-code	Patch

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commit: 002aaf5