fix(web): themed panel toggles show their disabled state

[flamboh]

Note

🤖 Opus 5 on behalf of Oliver

ELI5

The button that opens the right panel is greyed out when there's nothing to open. In any custom theme it wasn't actually greyed out — it looked identical to a working button. Now it's dimmed everywhere.

Problem

html[data-theme-id] [data-panel-layout-controls] [data-slot="toggle"] matches at specificity (0,3,1). The ghost variant's own disabled:text-muted-foreground compiles to a class plus :disabled — (0,2,0). The themed rule wins, so a disabled panel toggle kept the full-strength toolbar foreground and rendered exactly like an enabled one.

The comment on that rule accounts for hover and pressed, but not disabled. The default theme escaped it only because applyThemePalette leaves data-theme-id unset for the built-in palette, so the ghost variant is uncontested there.

Two surfaces hit this: the right-panel toggle on /pull-requests (disabled until a pull request is selected) and the terminal toggle in ChatView (disabled when no terminal is available). Those are the only two consumers of [data-panel-layout-controls] / [data-workspace-titlebar-controls].

Fix

Restate the disabled color alongside the rule that was overriding it. Adding :disabled takes it to (0,4,1), and the color is mixed from the theme's own tokens rather than hardcoded, so it follows user-authored palettes too:

--control-icon-color: color-mix(in oklab, var(--contrast-toolbar-foreground) 55%, var(--toolbar-background));

55% puts the themed disabled values next to the default theme's muted foreground rather than inventing a new level of dimming. Measured icon color, disabled vs enabled:

Theme	Before (disabled / enabled)	After (disabled / enabled)
Default · dark	L 0.604 / 0.970	unchanged
Default · light	L 0.552 / 0.274	unchanged
T3 Chat · dark	L 0.981 / 0.981	L 0.642 / 0.981
Ocean · dark	L 0.990 / 0.990	L 0.654 / 0.990
Ember · light	L 0.222 / 0.222	L 0.562 / 0.222

Mirrored across all four selectors from the rule above, including the tooltip-trigger ones — RightPanelMaximizeControl has TooltipTrigger render the Toggle directly, which is the case that rule's comment was written for, and keeping the pair in sync stops a future disabled trigger-rendered toggle from regressing the same way.

UI Changes

Captured on a dev server with real data, on /pull-requests. Both columns show the panel closed, so the only variable is whether the button is disabled. Left column: no pull request selected. Right column: one selected and the panel toggled shut.

Before

After

Notes

No test. This is a cascade fix, and per AGENTS.md a test that renders the component to assert a computed attribute would mirror the implementation. Evidence is the measurement above, taken through Chrome from the running app in all five built-in theme/appearance combinations. vp fmt applied; vp lint has no coverage for .css.

Written by Opus 5 in Claude Code.

Summary by CodeRabbit

• Bug Fixes
  • Improved the appearance of disabled panel-layout and workspace-titlebar controls.
  • Disabled toggle and tooltip-trigger controls now use a themed, visually distinct color for clearer differentiation from enabled controls.
  • Icon and text colors are now styled consistently across these disabled controls.

[macroscopeapp]

Approvability

Verdict: Approved at 0b0ed92

Macroscope's review found this PR approvable — This is a 12-line, CSS-only cascade fix that makes disabled themed controls visibly distinct while leaving enabled controls and application behavior unchanged. Its scope and runtime impact are limited to existing UI presentation.

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• apps/web/src/index.css

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📝 Walkthrough

Walkthrough

Adds themed CSS styling for disabled panel-layout and workspace-titlebar toggles and tooltip triggers.

Changes

Disabled Toggle Styling

Layer / File(s)	Summary
Themed disabled controls apps/web/src/index.css	Disabled toggle and tooltip-trigger controls use mixed --contrast-toolbar-foreground and --toolbar-background values for --control-icon-color and color.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Bug fix

Suggested reviewers: maria-rcks

Merge Risk: ⚪ Minimal · up to 0b0ed

The themed disabled-toggle styling is valid and does not introduce a merge-blocking risk.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: themed panel toggles now display their disabled state.
Description check	✅ Passed	The description explains the problem, root cause, fix, affected controls, validation, and UI changes with before/after screenshots. It does not include the template's Checklist section, but the requir…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In `@apps/web/src/index.css`:
- Line 1319: Insert a blank line before the color declaration following the
custom property in the affected CSS rule, preserving the existing declarations
and values.

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Dismissing prior approval to re-evaluate 0b0ed92