fix: Apply bug fixes from original repo PRs

[rianjs]

Summary

Apply 4 bug fix PRs from dexpota/kitty-themes that fix usability issues in existing themes.

Bug Fixes to Apply

PR	Theme	Problem
#64	OneDark	color5 doesn't match onedark.vim spec
#43	gruvbox_dark	Out of sync with morhetz/gruvbox upstream
#42	Solarized_Light	Selection nearly invisible (low contrast)
#41	Solarized_Dark	Selection nearly invisible (low contrast)

Related Issues

• Solarized Light in Vim sets background to dark in Kitty dexpota/kitty-themes#44, Solarized light "blind colors" dexpota/kitty-themes#33 - Solarized Light issues (addressed by Update Solarized_Light.conf dexpota/kitty-themes#42)
• color0 is invisible on several dark themes dexpota/kitty-themes#26 - color0 visibility (may be addressed by Update gruvbox_dark.conf from upstream dexpota/kitty-themes#43, Fix color5 in OneDark theme dexpota/kitty-themes#64)

Implementation

• One PR with separate commits per fix
• Each commit references the original dexpota PR
• Validate with ./scripts/validate-themes.sh

Checklist

• OneDark color5 fix
• gruvbox_dark upstream sync
• Solarized_Light selection fix
• Solarized_Dark selection fix
• Validate all themes pass CI

[rianjs]

Implementation Plan

Fixes Applied

Theme	Change	Source PR
OneDark	color5/color13: #be5046 → #c678dd	dexpota#64
gruvbox_dark	color11: #fabd2d → #fabd2f	dexpota#43
Solarized_Light	selection_background: #e9e2cb → #586e75, selection_foreground: #fcf4dc → #fdf6e3	dexpota#42
Solarized_Dark	selection_background: #002731 → #93a1a1, selection_foreground: #001e26 → #002b36	dexpota#41

Approach

1. Fetch patches from each PR via gh api
2. Apply changes to theme files
3. Validate with ./scripts/validate-themes.sh
4. Commit each fix individually with description

PR

See #14