Add sync error logging, extend error flash, fix unload saves

- Log workforce sync errors to backend stdout so they appear in docker logs
- Extend error flash from 5s to 15s so errors are readable
- Replace sendBeacon (POST-only) with keepalive fetch (PUT) on unload —
  sendBeacon was hitting 404s on all three unload saves

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

frontend/node_modules/smob/package.json

@@ -0,0 +1,75 @@
+{
+    "name": "smob",
+    "version": "1.6.2",
+    "description": "Zero dependency library to safe merge objects.",
+    "type": "module",
+    "main": "dist/index.cjs",
+    "module": "dist/index.mjs",
+    "types": "dist/index.d.mts",
+    "exports": {
+        "./package.json": "./package.json",
+        ".": {
+            "import": {
+                "types": "./dist/index.d.mts",
+                "default": "./dist/index.mjs"
+            },
+            "require": {
+                "types": "./dist/index.d.cts",
+                "default": "./dist/index.cjs"
+            }
+        }
+    },
+    "files": [
+        "dist"
+    ],
+    "engines": {
+        "node": ">=20.0.0"
+    },
+    "scripts": {
+        "build:types": "tsc",
+        "build:js": "tsdown",
+        "build": "npm run build:types && npm run build:js",
+        "lint": "eslint",
+        "lint:fix": "npm run lint -- --fix",
+        "test": "vitest --config test/vitest.config.ts --run",
+        "test:coverage": "vitest --config test/vitest.config.ts --run --coverage",
+        "prepare": "husky"
+    },
+    "author": {
+        "name": "Peter Placzek",
+        "email": "contact@tada5hi.net",
+        "url": "https://github.com/tada5hi"
+    },
+    "license": "MIT",
+    "keywords": [
+        "object",
+        "object-merge",
+        "merge",
+        "safe",
+        "deep-merge",
+        "merge-deep"
+    ],
+    "repository": {
+        "type": "git",
+        "url": "git+https://github.com/Tada5hi/smob.git"
+    },
+    "bugs": {
+        "url": "https://github.com/Tada5hi/smob/issues"
+    },
+    "homepage": "https://github.com/Tada5hi/smob#readme",
+    "publishConfig": {
+        "access": "public"
+    },
+    "devDependencies": {
+        "@tada5hi/commitlint-config": "^1.3.1",
+        "@tada5hi/eslint-config": "^2.3.0",
+        "@tada5hi/tsconfig": "^0.7.2",
+        "@vitest/coverage-v8": "^4.1.5",
+        "eslint": "^10.3.0",
+        "husky": "^9.1.7",
+        "tsdown": "^0.22.0",
+        "typescript": "^5.9.3",
+        "typescript-eslint": "^8.59.2",
+        "vitest": "^4.1.5"
+    }
+}