TP-06 — Map `editor_colors` to `QueryaEditorTheme`

[ZhuchkaTriplesix]

Epic: A
Depends on: TP-04

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

Goal

Convert custom editor color tokens into QueryaEditorTheme.

Files

• lib/core/theme/parser/querya_editor_theme_from_manifest.dart
• test/core/theme/parser/querya_editor_theme_from_manifest_test.dart

Implementation

Add:

QueryaEditorTheme editorThemeFromQueryaColors({
  required Map<String, String> colors,
  required QueryaEditorTheme fallback,
});

Support keys matching current QueryaEditorTheme fields. At minimum:

• background
• foreground
• selection
• lineNumber
• bracketMatch
• widgetBorder

If QueryaEditorTheme has additional fields, include them explicitly.

Fallback:

• missing/invalid key -> fallback field.

Acceptance Criteria

• Full fixture changes editor background/foreground/selection.
• Minimal fixture falls back for missing fields.
• Invalid optional color does not crash.

Tests

• full custom values;
• fallback behavior;
• invalid optional value.

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