feat: add ability to disable spinner animation

[anntnzrb]

Summary

Adds a new config option tui.animations (default: true) that allows users to disable spinner animations in the TUI. When disabled, a static [⋯] indicator is shown instead of the animated spinner.

Motivation

Several users have reported issues with the spinner animations:

1. Visual distraction - The animated spinner is visually intrusive for some users ([FEATURE]: option to make status bar static #6008)
2. Performance/CPU usage - Animations contribute to high CPU usage, especially on slower machines or when running on battery ([FEATURE]: Disable animations or lower FPS #3990, significant performance regression with text animation #2083, High CPU usage #4804, Heavy CPU Usage and making my M1 mac laggy after updating #4818)
3. Minimal environments - Users running OpenCode in TTY or minimal terminal environments prefer static indicators

Usage

{
  "tui": {
    "animations": false
  }
}

Design Decisions

Static indicator: [⋯]

The choice of [⋯] as the static indicator is subjective. The reasoning:

• Brackets provide clear visual boundaries
• Midline ellipsis (⋯) is a standard "loading/waiting" convention
• Avoided emojis and complex Unicode to ensure consistent rendering across terminals and fonts, including TTY environments

Open to suggestions for a better static indicator if there's a compelling alternative.

Keeping it simple

This PR only addresses enabling/disabling animations. Speed adjustment (mentioned in some issues) is intentionally left out to keep the change focused and minimal.

Related Issues

• Closes [FEATURE]: option to make status bar static #6008
• Closes [FEATURE]: Disable animations or lower FPS #3990
• Related to significant performance regression with text animation #2083, High CPU usage #4804, Heavy CPU Usage and making my M1 mac laggy after updating #4818, Unclear when model is busy or awaiting user input #3761

Changes

• packages/opencode/src/config/config.ts - Add animations boolean to TUI schema
• packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx - Conditional spinner/static indicator
• packages/opencode/src/cli/cmd/tui/component/dialog-session-list.tsx - Conditional spinner/static indicator
• packages/web/src/content/docs/config.mdx - Documentation
• packages/sdk/* - Auto-generated types

[rekram1-node]

The performance issues linked are from v0 or from other issues that have mostly been addressed (spinner shouldnt be an issue at this stage)

Are you getting performance issues? Or is this mostly a visual preference for you

[anntnzrb]

Mostly a visual preference — I can see how the animated spinner could be distracting for some users, and I empathize with those who reported it as "visually intrusive" (#6008).

That said, even if performance issues have been addressed, having the option to disable animations doesn't hurt. The implementation is minimal and some users in the linked issues explicitly asked for a way to turn off the animation regardless of performance.

Happy to adjust anything if needed.

[rekram1-node]

Instead of a configuration field, can you make it a toggle in the command palette? (you can persist selection to kv)

Can you also attach screenshot or video of what it looks like

[anntnzrb]

Updated with the requested changes:

• Removed tui.animations from config, now uses command palette toggle + KV persistence
• Toggle available in command palette (within a session) under "Session" category: "Enable/Disable animations"
• Static indicator [⋯] shown when animations disabled
• Setting persists and applies globally (Home screen, session list, session view)

Demo: https://streamable.com/h44erj

[rekram1-node]

/review

[rekram1-node]

I think this is good for now, the [...] is kinda ugly but ig if other people like this we can make it nicer later

[anntnzrb]

Addressed review feedback:

• Merged dev and resolved conflicts
• Removed unused animationsEnabled from context (components read directly from KV)
• Fixed reactivity bug in dialog-session-list.tsx by using <Show> instead of ternary

[rekram1-node]

/review

[github-actions]

lgtm

[rekram1-node]

Should be good to go, gonna merge when im active again