fix(tui): improve contrast and spinner cadence

[BunsDev]

Summary

• raise TUI muted/disabled theme colors so they meet AA contrast on their backgrounds
• route composer/status dim text through the shared muted color
• slow the animated status spinner to advance every two render ticks instead of every tick

Verification

• cargo fmt -p claurst-tui --check
• cargo test -p claurst-tui
• cargo check -p claurst
• git diff --check origin/main...HEAD

Fixes #55

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Project	Deployment	Actions	Updated (UTC)
docs	Ready	Preview	Jun 11, 2026 3:16am

[Copilot]

Pull request overview

Improves TUI accessibility and visual comfort by increasing muted/disabled text contrast and reducing the effective flash rate of the streaming status spinner.

Changes:

• Raised muted/disabled color values across themes to meet WCAG AA contrast targets on their intended backgrounds.
• Routed dim status/composer text through the shared COVEN_CODE_MUTED constant for consistent styling.
• Slowed the status spinner animation to advance every two render ticks and added a regression test for cadence.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src-rust/crates/tui/src/theme_colors.rs	Updates per-theme disabled colors and adds a contrast-ratio test to enforce WCAG AA for muted/disabled text on representative theme backgrounds.
src-rust/crates/tui/src/render.rs	Imports COVEN_CODE_MUTED, uses it for dim status/composer text, slows spinner frame advancement, and adds a test ensuring the new cadence.
src-rust/crates/tui/src/overlays.rs	Updates the shared muted color constant used across overlay rendering to the higher-contrast value.

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