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/jake/Makefile

@@ -0,0 +1,44 @@
+#
+# Jake JavaScript build tool
+# Copyright 2112 Matthew Eernisse (mde@fleegix.org)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+.PHONY: all build install clean uninstall
+
+PREFIX=/usr/local
+DESTDIR=
+
+all: build
+
+build:
+	@echo 'Jake built.'
+
+install:
+	@mkdir -p $(DESTDIR)$(PREFIX)/bin && \
+    mkdir -p $(DESTDIR)$(PREFIX)/lib/node_modules/jake && \
+    mkdir -p ./node_modules && \
+    npm install utilities minimatch && \
+		cp -R ./* $(DESTDIR)$(PREFIX)/lib/node_modules/jake/ && \
+		ln -snf ../lib/node_modules/jake/bin/cli.js $(DESTDIR)$(PREFIX)/bin/jake && \
+		chmod 755 $(DESTDIR)$(PREFIX)/lib/node_modules/jake/bin/cli.js && \
+		echo 'Jake installed.'
+
+clean:
+	@true
+
+uninstall:
+	@rm -f $(DESTDIR)$(PREFIX)/bin/jake && \
+		rm -fr $(DESTDIR)$(PREFIX)/lib/node_modules/jake/ && \
+		echo 'Jake uninstalled.'