Prepare for version 1.2.0

src/components/Header.js

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+import React from 'react';
+import { VERSION } from '../version';
+
+function Header({ theme, onThemeChange, currentPage, onPageChange }) {
+  return (
+    <div className="header-section py-2">
+      <div className="container">
+        <div className="row">
+          <div className="col-12 text-center position-relative">
+            <h2 className="mb-1">JMESPath Testing Tool</h2>
+            {/* Right side controls - better positioning */}
+            <div className="position-absolute top-0 end-0 d-flex align-items-center gap-2">
+              {/* API Key Management Button - more prominent */}
+              <button
+                type="button"
+                className={`btn btn-sm ${
+                  currentPage === 'apikey' 
+                    ? 'btn-warning fw-bold' 
+                    : 'btn-outline-warning'
+                }`}
+                onClick={() => onPageChange(currentPage === 'main' ? 'apikey' : 'main')}
+                title="API Key Management"
+              >
+                🔐 API Keys
+              </button>
+              {/* Theme switcher with theme-aware classes */}
+              <div className="btn-group btn-group-sm" role="group" aria-label="Theme switcher">
+                <button
+                  type="button"
+                  className={`btn ${
+                    theme === 'auto' 
+                      ? 'btn-primary' 
+                      : 'btn-outline-secondary'
+                  }`}
+                  onClick={() => onThemeChange('auto')}
+                  title="Auto (follow system)"
+                >
+                  🌓 Auto
+                </button>
+                <button
+                  type="button"
+                  className={`btn ${
+                    theme === 'light' 
+                      ? 'btn-primary' 
+                      : 'btn-outline-secondary'
+                  }`}
+                  onClick={() => onThemeChange('light')}
+                  title="Light theme"
+                >
+                  ☀️ Light
+                </button>
+                <button
+                  type="button"
+                  className={`btn ${
+                    theme === 'dark' 
+                      ? 'btn-primary' 
+                      : 'btn-outline-secondary'
+                  }`}
+                  onClick={() => onThemeChange('dark')}
+                  title="Dark theme"
+                >
+                  🌙 Dark
+                </button>
+              </div>
+            </div>
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+}
+
+export default Header;