fix: selected text inside the active line was invisible

[CodeMyst]

Closes #803

[Copilot]

Pull request overview

This pull request fixes issue #803 where selected text inside the active line was invisible in CodeMirror editors. The fix involves modifying all 8 CodeMirror theme files to adjust z-index layering and selection colors, plus removing conflicting hover styles from the Editor component.

Changes:

• Added position: "relative" and zIndex: -3 to .cm-activeLine in all theme files to push the active line background behind selection highlights
• Updated selection background colors in all themes to use more visible, semi-transparent colors
• Fixed a typo in dracula.ts selector (removed extra 'm' in .cm-selectionBackground)
• Removed background-color hover effects from Editor.svelte that could interfere with the new z-index layering

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
client/src/lib/codemirror-themes/solarized.ts	Applied z-index fix to active line, updated selection colors, removed unused selection variable
client/src/lib/codemirror-themes/rose-pine.ts	Applied z-index fix to active line, updated selection colors to semi-transparent
client/src/lib/codemirror-themes/rose-pine-dawn.ts	Applied z-index fix to active line, updated selection colors to semi-transparent
client/src/lib/codemirror-themes/myst.ts	Applied z-index fix to active line, updated selection colors, removed unused sel variable
client/src/lib/codemirror-themes/myst-light.ts	Applied z-index fix to active line, updated selection colors, removed unused sel variable
client/src/lib/codemirror-themes/dracula.ts	Applied z-index fix to active line, updated selection colors, fixed selector typo, removed unused selection variable
client/src/lib/codemirror-themes/catppuccin.ts	Applied z-index fix to active line, updated selection colors to semi-transparent
client/src/lib/codemirror-themes/catppuccin-late.ts	Applied z-index fix to active line, updated selection colors to semi-transparent
client/src/lib/Editor.svelte	Removed background-color hover effects that could conflict with theme z-index layering

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.