Lab Workstation: profile-aware Edge homepage + startup tabs

Lab profile in site-config.json now has:
  edgeHomepage: http://tsgwp00524.logon.ds.ge.com/
  edgeStartupTabs: WJ Shop Floor Homepage, M365 Webmail, Shopfloor Dashboard

08-EdgeDefaultBrowser.ps1 now resolves edge config from:
  pcProfile.edgeStartupTabs > siteConfig.edgeStartupTabs > hardcoded
  pcProfile.edgeHomepage > first startup tab (existing behavior)

This lets different PC types have different Edge configs:
  Standard-Machine: Plant Apps + Homepage + Dashboard (homepage = Plant Apps)
  Lab: Homepage + Webmail + Dashboard (homepage = tsgwp00524)

Added webmail URL to site-config.json urls section:
  "webmail": "https://outlook.office365.us/mail"

Lab gets no OpenText/UDC/eDNC — already filtered:
  OpenText + UDC: PCTypes = ["Standard"] in preinstall.json
  eDNC: Standard/01-eDNC.ps1 (type-specific, never runs for Lab)
  Office: from PPKG (shared across all shopfloor types)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

playbook/shopfloor-setup/site-config.json

@@ -9,7 +9,8 @@
   "urls": {
     "plantApps": "https://mes-wjefferson.apps.lr.geaerospace.net/run/?app_name=Plant%20Applications",
     "shopFloorHomepage": "http://tsgwp00524.logon.ds.ge.com/",
-    "shopfloorDashboard": "https://tsgwp00525.wjs.geaerospace.net/shopdb/shopfloor-dashboard/"
+    "shopfloorDashboard": "https://tsgwp00525.wjs.geaerospace.net/shopdb/shopfloor-dashboard/",
+    "webmail": "https://outlook.office365.us/mail"
   },
 
   "edgeStartupTabs": [
@@ -147,12 +148,18 @@
     },
 
     "Lab": {
-      "_comment": "No applications, minimal startup",
+      "_comment": "Lab Workstation - Office from ppkg, web URLs, custom Edge homepage + tabs",
       "startupItems": [],
       "taskbarPins": [
         { "name": "Microsoft Edge",  "lnkPath": "%ALLUSERSPROFILE%\\Microsoft\\Windows\\Start Menu\\Programs\\Microsoft Edge.lnk" }
       ],
-      "desktopApps": []
+      "desktopApps": [],
+      "edgeHomepage": "http://tsgwp00524.logon.ds.ge.com/",
+      "edgeStartupTabs": [
+        { "baseName": "WJ Shop Floor Homepage", "fallbackUrlKey": "shopFloorHomepage" },
+        { "baseName": "M365 Webmail",           "fallbackUrlKey": "webmail" },
+        { "baseName": "Shopfloor Dashboard",    "fallbackUrlKey": "shopfloorDashboard" }
+      ]
     },
 
     "Display-Lobby": {