[FEATURE]: Add quick permission preset switching in chat UI

[Innerpeace1990]

Feature hasn't been suggested before

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

Current behavior:
Permission configuration is only available by manually editing opencode.jsonc, and applies as a single global setting. There is no way to quickly switch between different permission levels during a session.

For users who are not comfortable editing JSON configuration, setting up custom permissions has a high barrier to entry.

Suggested enhancement:
Add a permission preset selector in the chat UI (e.g., in the toolbar or status bar) that allows users to quickly switch between predefined permission schemes:

• Default: opencode's standard permission model (ask before each sensitive operation)
• Custom: reads the user's permission config from opencode.jsonc
• Full access: allows all operations without prompting, suitable for trusted environments where maximum productivity is needed

This would allow users to:

• Start a session in Full access mode for trusted, repetitive tasks
• Switch to Default mode when more caution is needed
• Use Custom for finely-tuned permission configurations
• Change permission levels without restarting or editing config files

Related: #23258 (permission model too noisy for autonomous sessions)

Environment:

• OS: Windows 11 (Build 26200, 25H2)
• opencode Desktop: v1.14.50

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• [FEATURE]: Add --dangerously-skip-permissions (aka YOLO mode) #8463: Proposes --dangerously-skip-permissions / YOLO mode, which overlaps with the "Full access" preset concept in this request
• [FEATURE]: Autopilot-like mode #16231: Requests an autopilot-like mode with auto-approval for all permission prompts, similar in intent
• Permission model: project-local routine approvals + sibling worktree trust are too noisy for autonomous contributor sessions #23258: The permission model noise issue you already referenced — some responses there may address parts of this request

If your request is specifically about the in-chat UI switcher between named presets (rather than a CLI flag or global toggle), it may be distinct enough to stand on its own — but please review the above issues to avoid fragmentation.