feat: introduce v2.0 abstraction layer with core types, backend interface, and plugin system

feat: add fade effects with API control and real-time event subscription
test: add API integration tests with isolated test environment and coverage reporting
build: update Makefile for recursive source finding, dynamic linking, and test targets
docs: document abstraction layer, fade effects, and API enhancements in README

tests/css/style.css

@@ -0,0 +1,63 @@
+body {
+ font-family: Arial, sans-serif;
+ margin: 0;
+ padding: 0;
+ background-color: #f4f4f4;
+}
+header {
+ background-color: #333;
+ color: #fff;
+ padding: 10px 20px;
+}
+header h1 {
+ margin: 0;
+}
+nav a {
+ color: #fff;
+ margin: 0 10px;
+ text-decoration: none;
+}
+nav a:hover {
+ text-decoration: underline;
+}
+main {
+ padding: 20px;
+}
+footer {
+ background-color: #333;
+ color: #fff;
+ text-align: center;
+ padding: 10px 20px;
+ position: fixed;
+ bottom: 0;
+ width: 100%;
+}
+form {
+ background-color: #fff;
+ padding: 20px;
+ border-radius: 5px;
+ box-shadow: 0 0 10px rgba(0,0,0,0.1);
+}
+label {
+ display: block;
+ margin-top: 10px;
+}
+input, textarea {
+ width: 100%;
+ padding: 8px;
+ margin-top: 5px;
+ border: 1px solid #ccc;
+ border-radius: 4px;
+}
+button {
+ margin-top: 10px;
+ padding: 10px 15px;
+ background-color: #333;
+ color: #fff;
+ border: none;
+ border-radius: 4px;
+ cursor: pointer;
+}
+button:hover {
+ background-color: #555;
+}