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/d3-time-format/locale/he-IL.json

@@ -0,0 +1,10 @@
+{
+  "dateTime": "%A, %e ב%B %Y %X",
+  "date": "%d.%m.%Y",
+  "time": "%H:%M:%S",
+  "periods": ["AM", "PM"],
+  "days": ["ראשון", "שני", "שלישי", "רביעי", "חמישי", "שישי", "שבת"],
+  "shortDays": ["א׳", "ב׳", "ג׳", "ד׳", "ה׳", "ו׳", "ש׳"],
+  "months": ["ינואר", "פברואר", "מרץ", "אפריל", "מאי", "יוני", "יולי", "אוגוסט", "ספטמבר", "אוקטובר", "נובמבר", "דצמבר"],
+  "shortMonths": ["ינו׳", "פבר׳", "מרץ", "אפר׳", "מאי", "יוני", "יולי", "אוג׳", "ספט׳", "אוק׳", "נוב׳", "דצמ׳"]
+}