WebUI: thinking/reasoning blocks hidden after response completion, no way to show them

Problem

In the TUI, users can toggle thinking/reasoning blocks visibility with /thinking command (default: visible).

In the WebUI, thinking blocks are always hidden after response completion with no way to show them:

// session-turn.tsx:562
hideReasoning={!working()}  // hardcoded, no toggle

Expected Behavior
WebUI should have the same /thinking command as TUI to toggle visibility.

Environment
OpenCode version: latest dev
Interface: WebUI

This issue might be a duplicate of an existing issue or related to a regression. Please check:

Regression: /thinking command missing. #4371: Regression: /thinking command missing. - The /thinking command that existed in 0.x version no longer appears in 1.x, which is directly related to the feature you're requesting for the WebUI.

Feel free to ignore if this doesn't address your specific case.

To stay organized issues are automatically closed after 90 days of no activity. If the issue is still relevant please open a new one.

feat(ui): Add thinking/reasoning block visibility toggle

I hope this gets resolved quickly—the GUI can come across as unreliable or buggy for non‑technical users in its current state.

feat(session-ui,app): collapsible reasoning cards for desktop/web