Develop (#55)

feat: optimize dashboard/search UX and simplify extension architecture

Redesign Dashboard with compact tool grid and recently used tools
Improve TopBar search UX with Cmd/Ctrl+K shortcut and better history navigation
Reorganize project structure into src/
Migrate i18n from react-i18next to chrome.i18n
Remove runtime language switch and settings page
Remove HTML/Markdown conversion tools
Clean up unused code, dead animations, redundant comments, and imports
Improve component consistency with shadcn/ui patterns
Replace hardcoded strings/colors with i18n tokens and theme tokens
Add comprehensive project documentation and coding standards
Fix CI artifact upload workflow and multiple TypeScript/test issues

Includes various refactors, UI polish, i18n cleanup, CI improvements,
and maintenance updates across the codebase.

src/utils/__tests__/jsonMinify.test.ts

@@ -0,0 +1,88 @@
+import { describe, it, expect } from 'vitest';
+import { minifyJson } from '../jsonFormatter';
+
+describe('minifyJson', () => {
+  it('should minify formatted JSON', () => {
+    const input = '{\n  "name": "test",\n  "value": 123\n}';
+    const result = minifyJson(input);
+    expect(result.minified).toBe('{"name":"test","value":123}');
+  });
+
+  it('should return empty result for empty input', () => {
+    const result = minifyJson('');
+    expect(result.minified).toBe('');
+    expect(result.originalBytes).toBe(0);
+    expect(result.minifiedBytes).toBe(0);
+  });
+
+  it('should return empty result for whitespace-only input', () => {
+    const result = minifyJson('   ');
+    expect(result.minified).toBe('');
+  });
+
+  it('should handle already minified JSON', () => {
+    const input = '{"a":1}';
+    const result = minifyJson(input);
+    expect(result.minified).toBe('{"a":1}');
+  });
+
+  it('should remove all whitespace', () => {
+    const input = '{\n  "key"  :  "value"  ,\n  "num"  :  42\n}';
+    const result = minifyJson(input);
+    expect(result.minified).toBe('{"key":"value","num":42}');
+  });
+
+  it('should preserve string content with spaces', () => {
+    const input = '{"message":"hello world"}';
+    const result = minifyJson(input);
+    expect(result.minified).toBe('{"message":"hello world"}');
+  });
+
+  it('should handle arrays', () => {
+    const input = '[\n  1,\n  2,\n  3\n]';
+    const result = minifyJson(input);
+    expect(result.minified).toBe('[1,2,3]');
+  });
+
+  it('should handle nested objects', () => {
+    const input = '{\n  "a": {\n    "b": 1\n  }\n}';
+    const result = minifyJson(input);
+    expect(result.minified).toBe('{"a":{"b":1}}');
+  });
+
+  it('should handle primitive values', () => {
+    expect(minifyJson('null').minified).toBe('null');
+    expect(minifyJson('true').minified).toBe('true');
+    expect(minifyJson('42').minified).toBe('42');
+    expect(minifyJson('"hello"').minified).toBe('"hello"');
+  });
+
+  it('should throw SyntaxError for invalid JSON', () => {
+    expect(() => minifyJson('{invalid}')).toThrow(SyntaxError);
+  });
+
+  it('should calculate byte sizes correctly', () => {
+    const input = '{\n  "a": 1\n}';
+    const result = minifyJson(input);
+    expect(result.originalBytes).toBeGreaterThan(0);
+    expect(result.minifiedBytes).toBeGreaterThan(0);
+    // Minified should be smaller than original for formatted input
+    expect(result.minifiedBytes).toBeLessThan(result.originalBytes);
+  });
+
+  it('should handle Unicode content', () => {
+    const input = '{\n  "名前": "テスト"\n}';
+    const result = minifyJson(input);
+    expect(result.minified).toBe('{"名前":"テスト"}');
+  });
+
+  it('should handle empty object', () => {
+    const result = minifyJson('{}');
+    expect(result.minified).toBe('{}');
+  });
+
+  it('should handle empty array', () => {
+    const result = minifyJson('[]');
+    expect(result.minified).toBe('[]');
+  });
+});