Replaces the two hard-coded .qss files with a single
resources/style_template.qss that uses @{token} placeholders.
apply_qss() now does regex substitution at runtime, so adding a
theme only requires a palette dict — no duplicate stylesheets.
New themes (Preferences → Color theme):
• One Dark Pro — VS Code classic dark
• Nord — arctic blue-gray dark
• Tokyo Night — deep purple-dark
• Dracula — classic purple-dark
• GitHub Light — clean minimal light
Existing Catppuccin Frappé (dark) and Latte (light) are unchanged.
Ctrl+Shift+T quick-toggle now recognises all dark themes via is_dark().
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
nngoandClaude Sonnet 4.6
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