[Bug]: AI chat message text cannot be selected or copied manually

[kohai-ut]

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• I have searched the existing issues

Describe the bug

Text in AI chat messages cannot be selected with the mouse in the packaged OpenScreen desktop app. As a result, users cannot manually copy all or part of an AI response with Ctrl+C or the Edit → Copy command.

This is particularly disruptive when the AI supplies commands or code and the message's Copy message button also fails.

Expected behavior

Users should be able to select any portion of a user or assistant message and copy the selection using the standard platform clipboard controls.

To Reproduce

1. Open OpenScreen Studio.
2. Open the AI chat panel and select a conversation containing a response.
3. Drag across text in the response to select it.
4. Observe that no text selection is created, so Ctrl+C and Edit → Copy cannot copy the message text.

Screenshots

Not attached; the failure is the absence of a text-selection highlight while dragging across a message.

OS

Windows

OS Version

Windows 11

Browser

Other

Other Browser

Packaged Electron desktop application

Additional context

• OpenScreen version: 1.13.0-rc.2 (1.13.0.0 product version).
• I searched open and closed issues for select text, text selection, user-select, and related AI-chat terms and found no matching report.
• The global stylesheet sets user-select: none on body:
  

  openscreen/src/index.css

  Lines 67 to 71 in f418465

  	body {
  	@apply bg-background text-foreground;
  	-webkit-user-select: none;
  	user-select: none;
  	overflow: hidden;

• The editor shell also sets user-select: none:
  

  openscreen/src/components/ai-edition/NewEditorShell.module.css

  Lines 12 to 17 in f418465

  	font-family: var(--font-body);
  	font-size: var(--fs-app);
  	line-height: 1.5;
  	overflow: hidden;
  	user-select: none;
  	}

• .msgBubble does not override the inherited rule with user-select: text:
  

  openscreen/src/components/ai-edition/NewEditorShell.module.css

  Lines 1366 to 1374 in f418465

  	.msgBubble {
  	padding: var(--sp-3) var(--sp-4);
  	border-radius: var(--r-md);
  	background: var(--bg);
  	border: 1px solid var(--border);
  	font-size: var(--fs-app);
  	color: var(--fg-2);
  	line-height: 1.5;
  	}

• The same CSS behavior is present in v1.12.2, v1.13.0-rc.1 through v1.13.0-rc.4, and current main.

The likely fix is to enable user-select: text for chat-message content (and expanded thinking content, if intended to be copyable) while retaining user-select: none on non-text editor controls.