feat(theme): QueryaTheme factory from custom manifest (#103)

lib/core/theme/parser/querya_theme_from_manifest.dart

@@ -0,0 +1,48 @@
+import 'package:flutter/material.dart';
+
+import '../querya_theme.dart';
+import 'apply_token_colors_to_editor.dart';
+import 'querya_editor_theme_from_manifest.dart';
+import 'querya_theme_color_scheme.dart';
+import 'querya_theme_manifest.dart';
+import 'querya_workbench_theme_from_manifest.dart';
+
+/// Builds a [QueryaTheme] from a parsed Querya custom theme manifest.
+QueryaTheme queryaThemeFromManifest(QueryaThemeManifest manifest) {
+  final fallback =
+      manifest.isLight ? QueryaTheme.lightDefault : QueryaTheme.darkDefault;
+  final brightness =
+      manifest.isLight ? Brightness.light : Brightness.dark;
+
+  var editor = editorThemeFromQueryaColors(
+    colors: manifest.editorColors,
+    fallback: fallback.editor,
+  );
+  final workbench = workbenchThemeFromQueryaColors(
+    colors: manifest.editorColors,
+    fallback: fallback.workbench,
+  );
+
+  if (manifest.editorColors.containsKey('editorBackground') &&
+      editor.background != workbench.editorBackground) {
+    editor = editor.copyWith(background: workbench.editorBackground);
+  }
+
+  final tokenColors = manifest.tokenColors;
+  if (tokenColors.isNotEmpty) {
+    editor = applyTokenColorsToEditor(editor, tokenColors);
+  }
+
+  final colorScheme = colorSchemeFromQueryaThemeColors(
+    colors: manifest.shadcnColors,
+    fallback: fallback,
+  );
+
+  return fallback.copyWith(
+    workbench: workbench,
+    editor: editor,
+    brightness: brightness,
+    colorScheme: colorScheme,
+    tokenColors: tokenColors,
+  );
+}

test/core/theme/parser/querya_theme_from_manifest_test.dart

@@ -0,0 +1,70 @@
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:querya_desktop/core/theme/parser/color_parser.dart';
+import 'package:querya_desktop/core/theme/parser/querya_theme_from_manifest.dart';
+import 'package:querya_desktop/core/theme/parser/querya_theme_manifest.dart';
+import 'package:querya_desktop/core/theme/querya_theme.dart';
+
+void main() {
+  group('queryaThemeFromManifest', () {
+    test('full dark fixture builds dark QueryaTheme', () {
+      final raw =
+          File('test/fixtures/themes/querya_custom_dark.json').readAsStringSync();
+      final manifest = QueryaThemeManifest.fromJsonString(raw);
+      final theme = queryaThemeFromManifest(manifest);
+
+      expect(theme.brightness, Brightness.dark);
+      expect(theme.colorScheme.primary, parseQueryaThemeColor('#38BDF8'));
+      expect(theme.workbench.canvas, parseQueryaThemeColor('#09090B'));
+      expect(theme.editor.background, parseQueryaThemeColor('#0F1117'));
+      expect(theme.editor.selection, parseQueryaThemeColor('#264F78'));
+    });
+
+    test('full light fixture builds light QueryaTheme', () {
+      final raw =
+          File('test/fixtures/themes/querya_custom_light.json').readAsStringSync();
+      final manifest = QueryaThemeManifest.fromJsonString(raw);
+      final theme = queryaThemeFromManifest(manifest);
+
+      expect(theme.brightness, Brightness.light);
+      expect(theme.colorScheme.background, parseQueryaThemeColor('#F8FAFC'));
+      expect(theme.workbench.surface, parseQueryaThemeColor('#FFFFFF'));
+      expect(theme.editor.foreground, parseQueryaThemeColor('#1E293B'));
+    });
+
+    test('preserves tokenColors from manifest', () {
+      final raw =
+          File('test/fixtures/themes/querya_custom_dark.json').readAsStringSync();
+      final manifest = QueryaThemeManifest.fromJsonString(raw);
+      final theme = queryaThemeFromManifest(manifest);
+
+      expect(theme.tokenColors.length, manifest.tokenColors.length);
+      expect(theme.tokenColors.first.scopes, ['comment', 'comment.line']);
+    });
+
+    test('minimal fixture falls back to preset defaults', () {
+      final raw = File('test/fixtures/themes/querya_custom_minimal.json')
+          .readAsStringSync();
+      final manifest = QueryaThemeManifest.fromJsonString(raw);
+      final theme = queryaThemeFromManifest(manifest);
+      const fallback = QueryaTheme.darkDefault;
+
+      expect(theme.brightness, Brightness.dark);
+      expect(theme.colorScheme.primary, parseQueryaThemeColor('#FF00AA'));
+      expect(theme.editor.background, parseQueryaThemeColor('#010203'));
+      expect(theme.editor.foreground, fallback.editor.foreground);
+      expect(theme.workbench.canvas, fallback.workbench.canvas);
+      expect(theme.tokenColors, isEmpty);
+    });
+
+    test('does not create ThemeData', () {
+      final raw =
+          File('test/fixtures/themes/querya_custom_dark.json').readAsStringSync();
+      final manifest = QueryaThemeManifest.fromJsonString(raw);
+
+      expect(queryaThemeFromManifest(manifest), isA<QueryaTheme>());
+    });
+  });
+}