TP-07 — Map `editor_colors` to `QueryaWorkbenchTheme`

[ZhuchkaTriplesix]

Epic: A
Depends on: TP-04

Source: docs/theme-parser-github-issues.md

Goal

Convert workbench-related custom tokens into QueryaWorkbenchTheme.

Files

• lib/core/theme/parser/querya_workbench_theme_from_manifest.dart
• test/core/theme/parser/querya_workbench_theme_from_manifest_test.dart

Implementation

Add:

QueryaWorkbenchTheme workbenchThemeFromQueryaColors({
  required Map<String, String> colors,
  required QueryaWorkbenchTheme fallback,
});

Support keys:

• sidebarBackground
• canvas
• surface
• editorBackground
• mutedForeground
• accent
• onAccent
• borderSubtle
• destructive
• gitModified
• gitUntracked

If the docs use background, map it deliberately:

• background -> canvas and/or editorBackground only if explicit in docs.

Acceptance Criteria

• Mapping is documented in code comments or docs table.
• Missing keys use fallback.
• Invalid optional colors use fallback.

Tests

• full custom workbench mapping;
• minimal fallback;
• invalid optional value.

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