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/psl/vite.config.js

@@ -0,0 +1,20 @@
+import { resolve } from 'node:path';
+import { defineConfig } from 'vite';
+
+export default defineConfig({
+  build: {
+    target: 'es2015',
+    lib: {
+      entry: resolve(__dirname, 'index.js'),
+      name: 'psl',
+      formats: ['es', 'cjs', 'umd'],
+      fileName: format => (
+        format === 'umd'
+          ? 'psl.umd.cjs'
+          : format === 'cjs'
+            ? 'psl.cjs'
+            : 'psl.mjs'
+      ),
+    },
+  },
+});