feat: permanent calendar with editable day modal and per-subject bar chart

- Calendar moved out of List/Group tab toggle — always visible below cross-
  subject analytics (ExperimentAnalysisCharts)
- Day modal shows all subjects: existing data as read-only + Edit button,
  missing data as + Add button; both open DailyStatusForm inline
- Status changes/creates propagate up to parent via onStatusChange/onStatusCreate
  and calendar counts recompute locally (no extra API round-trip)
- Bar chart (recharts) at bottom: Total/Success/Failure bars per subject plus
  % complete text, grouped by subject name
- Tests updated: 17 ExperimentCalendar tests, 76 total passing

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

frontend/package.json

@@ -12,11 +12,11 @@
   },
   "dependencies": {
     "axios": "^1.7.2",
-    "recharts": "^2.12.7",
     "date-fns": "^3.6.0",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
-    "react-router-dom": "^6.24.0"
+    "react-router-dom": "^6.24.0",
+    "recharts": "^2.15.4"
   },
   "devDependencies": {
     "@babel/core": "^7.24.7",
@@ -38,8 +38,12 @@
   },
   "jest": {
     "testEnvironment": "jsdom",
-    "setupFilesAfterEnv": ["<rootDir>/tests/setup.js"],
-    "testMatch": ["**/tests/**/*.test.{js,jsx}"],
+    "setupFilesAfterEnv": [
+      "<rootDir>/tests/setup.js"
+    ],
+    "testMatch": [
+      "**/tests/**/*.test.{js,jsx}"
+    ],
     "transform": {
       "^.+\\.[jt]sx?$": "babel-jest"
     },