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/bin/bash_completion.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+
+# http://stackoverflow.com/a/246128
+SOURCE="${BASH_SOURCE[0]}"
+while [ -h "$SOURCE" ]; do # resolve $SOURCE until the file is no longer a symlink
+  DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
+  SOURCE="$(readlink "$SOURCE")"
+  [[ $SOURCE != /* ]] && SOURCE="$DIR/$SOURCE" # if $SOURCE was a relative symlink, we need to resolve it relative to the path where the symlink file was located
+done
+JAKE_BIN_DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
+
+# http://stackoverflow.com/a/12495480
+# http://stackoverflow.com/a/28647824
+_auto_jake()
+{
+    local cur
+    local -a COMPGEN=()
+    _get_comp_words_by_ref -n : -c cur
+    
+    # run auto-completions in jake via our auto_complete.js wrapper
+    local -a auto_complete_info=( $(export COMP_LINE="${COMP_LINE}" && ${JAKE_BIN_DIR}/auto_complete.js "$cur" "${3}") )
+    # check reply flag
+    local reply_flag="${auto_complete_info[0]}"
+    if [[ "${reply_flag}" == "no-complete" ]]; then
+        return 1
+    fi
+    local auto_completions=("${auto_complete_info[@]:1}")
+    COMPGEN=( $(compgen -W "${auto_completions[*]}" -- "$cur") )
+    COMPREPLY=( "${COMPGEN[@]}" )
+    
+    __ltrim_colon_completions "$cur"
+    
+    # do we need another space??
+    if [[ "${reply_flag}" == "yes-space" ]]; then
+        COMPREPLY=( "${COMPGEN[@]}" " " )
+    fi
+    
+    return 0
+} 
+
+complete -o default -F _auto_jake jake