Initial commit: timeline-elements-ui library

Angular 19 component library for timelines and event tracking:
timeline, Gantt chart, event cards, date markers, connectors,
and custom event templates. Includes signal-based services,
SCSS design tokens with dark mode, and TypeScript type definitions.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tsconfig.lib.json

@@ -0,0 +1,18 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./dist/out-tsc",
+    "declaration": true,
+    "declarationMap": true,
+    "inlineSources": true,
+    "types": []
+  },
+  "exclude": [
+    "**/*.spec.ts",
+    "**/*.test.ts",
+    "**/*.stories.ts"
+  ],
+  "angularCompilerOptions": {
+    "compilationMode": "partial"
+  }
+}