Add side panels, task selection, graph animation, and project docs

- Foldable left panel (user profile) and right panel (task details)
- Clicking a task in the list or graph node selects it and shows details
- Both views (task list + graph) always mounted via absolute inset-0 for
  correct canvas dimensions; tabs toggle visibility with opacity
- Graph node selection animation: other nodes repel outward (charge -600),
  then selected node smoothly slides to center (500ms cubic ease-out),
  then charge restores to -120 and graph stabilizes
- Graph re-fits on tab switch and panel resize via ResizeObserver
- Fix UUID string IDs throughout (backend returns UUIDs, not integers)
- Add TaskDetailPanel, UserPanel components
- Add CLAUDE.md project documentation

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

frontend/node_modules/is-generator-fn/index.d.ts

@@ -0,0 +1,24 @@
+declare const isGeneratorFn: {
+	/**
+	Check if something is a generator function.
+
+	@example
+	```
+	import isGeneratorFn = require('is-generator-fn');
+
+	isGeneratorFn(function * () {});
+	//=> true
+
+	isGeneratorFn(function () {});
+	//=> false
+	```
+	*/
+	(value: unknown): value is GeneratorFunction;
+
+	// TODO: Remove this for the next major release, refactor the whole definition to:
+	// declare function isGeneratorFn(value: unknown): value is GeneratorFunction;
+	// export = isGeneratorFn;
+	default: typeof isGeneratorFn;
+};
+
+export = isGeneratorFn;