TUI crashes with TextNodeRenderable error after switching sessions from a folder

[devinoldenburg]

Summary

The TUI crashes with a fatal TextNodeRenderable rendering error when switching to another session after entering a folder.

Reproduction

Reported user flow:

1. Open Codeplane TUI.
2. Enter/navigate into a folder.
3. Switch to another session in the TUI.
4. The TUI shows a fatal error screen.

Error

A fatal error occurred!

Error: TextNodeRenderable only accepts strings, TextNodeRenderable instances, or StyledText instances
    at add (/opt/homebrew/lib/node_modules/codeplane-ai/node_modules/codeplane-darwin-arm64/bin/runtime/tui/node-main.js:81:238324)
    at vEo (/opt/homebrew/lib/node_modules/codeplane-ai/node_modules/codeplane-darwin-arm64/bin/runtime/tui/node-main.js:169:78805)
    at children (/opt/homebrew/lib/node_modules/codeplane-ai/node_modules/codeplane-darwin-arm64/bin/runtime/tui/node-main.js:2045:23611)
    at <anonymous> (/opt/homebrew/lib/node_modules/codeplane-ai/node_modules/codeplane-darwin-arm64/bin/runtime/tui/node-main.js:169:22686)
    at wOn (/opt/homebrew/lib/node_modules/codeplane-ai/node_modules/codeplane-darwin-arm64/bin/runtime/tui/node-main.js:169:12083)
    at d_ (/opt/homebrew/lib/node_modules/codeplane-ai/node_modules/codeplane-darwin-arm64/bin/runtime/tui/node-main.js:169:11845)
    at Tfe (/opt/homebrew/lib/node_modules/codeplane-ai/node_modules/codeplane-darwin-arm64/bin/runtime/tui/node-main.js:169:13707)
    at vOn (/opt/homebrew/lib/node_modules/codeplane-ai/node_modules/codeplane-darwin-arm64/bin/runtime/tui/node-main.js:169:14672)
    at Rko (/opt/homebrew/lib/node_modules/codeplane-ai/node_modules/codeplane-darwin-arm64/bin/runtime/tui/node-main.js:169:14007)
    at wv (/opt/homebrew/lib/node_modules/codeplane-ai/node_modules/codeplane-darwin-arm64/bin/runtime/tui/node-main.js:169:13901)
    at y (/opt/homebrew/lib/node_modules/codeplane-ai/node_modules/codeplane-darwin-arm64/bin/runtime/tui/node-main.js:1134:10933)
    at async sync (/opt/homebrew/lib/node_modules/codeplane-ai/node_modules/codeplane-darwin-arm64/bin/runtime/tui/node-main.js:1134:11878)
    at async <anonymous> (/opt/homebrew/lib/node_modules/codeplane-ai/node_modules/codeplane-darwin-arm64/bin/runtime/tui/node-main.js:2163:3332)
    at processTicksAndRejections (native:7:39)

Environment

• Surface: TUI
• Install path from stack: /opt/homebrew/lib/node_modules/codeplane-ai/...
• Platform: macOS, Homebrew-managed Node global install path
• Package binary: codeplane-darwin-arm64

Notes

The crash screen offers "Copy Issue URL (exception info pre-filled)", "Reset TUI", and "Exit". The visible bottom status line repeats:

TextNodeRenderable only accepts strings, TextNodeRenderable instances, or StyledText instances

[devinoldenburg]

Additional context from the reporter:

• The affected session had a PDF attachment present.
• The agent repeatedly failed while working with the PDF, even though the selected model was GPT-5.5.
• Expected behavior: PDF handling should work with GPT-5.5, so the repeated PDF failures may be related to the TUI/session switch crash or attachment rendering/state handling.

[devinoldenburg]

Additional clarification from the reporter:

• Opening the PDF worked in the desktop app.
• Opening the same PDF did not work in the TUI.

This suggests the issue may be specific to TUI attachment/PDF handling rather than the PDF file itself.

[devinoldenburg]

Additional clarification from the reporter:

• The crash also happens without a PDF attachment.
• The PDF behavior is additional context, but the core TUI crash is not limited to sessions with PDFs.