[JetBrains Plugin] Image attachments in chat fail — temp files deleted before agent can read them

Environment

• Plugin: Claude Code [Beta] v0.1.14-beta
• IDE: IntelliJ IDEA 2026.1
• OS: macOS 15.x (Darwin)

Steps to reproduce

1. Open a project in IntelliJ with the Claude Code plugin
2. Start a chat with Claude
3. Paste a screenshot into the chat input
4. Ask Claude to read/describe the image

Expected behavior

Claude can see and analyze the pasted screenshot.

Actual behavior

Claude responds with "File does not exist" because the image is placed in a macOS temp directory (/var/folders/.../T/ai-chat-attachment-*.png) which gets cleaned up by the OS before the agent has a chance to read it.

Root cause

The plugin stores pasted image attachments in the system temp directory rather than a persistent location. macOS periodically cleans /var/folders/.../T/, and the file is gone by the time the Claude agent toolkit tries to access it.

Suggested fix

Copy image attachments to a persistent directory before passing the path to Claude, e.g. ~/.claude/attachments/ or the project's .claude/ directory, instead of using the system temp directory directly.