feat(restream): Add default sign-in configuration

This commit introduces a new `restream.signin` configuration block to the platform-specific settings files (`settings/config_linux_0.json` and `settings/config_mac_0.json`).

This configuration provides default parameters for interacting with the Restream login page, supporting the `restream sign in support` feature:
- Defines the `url` for the Restream login page.
- Specifies a default `userAgent` string.
- Sets the default `size` (width and height) for the sign-in window.
- Configures `closeOnNavigate` and `allowPopups` behavior for the sign-in flow.

[auto-enhanced]

Author: steveseguin

settings/config_linux_0.json

@@ -31,6 +31,17 @@
     "discord": {
 	"userAgent": "Chrome"
   },
+      "restream": {
+    "signin": {
+      "url": "https://restream.io/login",
+      "userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36",
+	  "size": {
+        "width": 1280,
+        "height": 720
+      },
+	  "closeOnNavigate": true,
+	  "allowPopups": false
+    }
   "tiktok": {
     "userAgent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36",
     "mockUserAgentData": {

settings/config_mac_0.json

@@ -31,6 +31,17 @@
 	  "allowPopups": false
     }
   },
+      "restream": {
+    "signin": {
+      "url": "https://restream.io/login",
+      "userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36",
+	  "size": {
+        "width": 1280,
+        "height": 720
+      },
+	  "closeOnNavigate": true,
+	  "allowPopups": false
+    }
   "tiktok": {
     "userAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36",
     "mockUserAgentData": {