[FEATURE]:Allow reasoning summaries to be manually expandable per message (not just global toggle) #31825

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Describe the enhancement you want to request

name: Feature Request
description: Allow reasoning summaries to be manually expandable per message
title: "[FEATURE]: Allow reasoning summaries to be manually expandable per message (not just global toggle)"
labels: [enhancement]
body:

• type: textarea
  id: description
  attributes:
  label: Description
  description: A clear and concise description of what you want to happen.
  value: |
  Problem
  Currently, the OpenCode desktop UI has a single global setting: "Show reasoning summary" (on/off) that controls whether all reasoning summaries are displayed or hidden. There is no way to see reasoning for individual messages without toggling the global setting, which then shows all reasoning summaries at once.

  **Desired Behavior**
  Allow reasoning summaries to be set to "collapsed" by default (via the existing toggle), but make each summary **manually expandable by clicking** on it — similar to how the shell/CLI version works, where you can choose to expand a specific reasoning block per message.
  
  **Use Case**
  - I want to keep the conversation clean (reasoning hidden by default)
  - But occasionally I want to peek at the reasoning for a *specific* response without having to toggle the global setting on/off
  
  **Suggestion**
  Change the behavior so that when "Show reasoning summary" is OFF, each reasoning block is rendered as a collapsible element (e.g., a small "Show reasoning" toggle per message), and clicking it expands only that one block. This gives per-message granularity while preserving a clean default view.
  

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• type: textarea
  id: alternatives
  attributes:
  label: Alternatives
  description: A clear and concise description of any alternative solutions or features you've considered.
  value: |
  1. Keep the global toggle but add a third state: "Hidden / Collapsible / Always visible"
  2. Add a keyboard shortcut to expand/collapse reasoning for the last message
  3. No change — use shell version instead (which already supports this behavior)

• type: textarea
  id: context
  attributes:
  label: Additional context
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  - The shell/CLI version of OpenCode already supports per-message expandable reasoning — this request is about bringing parity to the desktop UI
  - OS: Windows
  - OpenCode version: latest