Prepare v1.73.0-beta.8 and preserve dialog footer targets

Restore the shared footer minimum exposed by the #505 Linux screenshot gate; the focused browser assertion fails before the restoration and passes after it.

Issue: #505
Issue: #495
User-Visible: yes

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "houseplan-card",
-  "version": "1.73.0-beta.7",
+  "version": "1.73.0-beta.8",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "houseplan-card",
-      "version": "1.73.0-beta.7",
+      "version": "1.73.0-beta.8",
       "license": "MIT",
       "dependencies": {
         "lit": "^3.1.3",