Fix electron-builder 26.0.12 configuration compatibility

- Update Linux desktop configuration to use desktop.entry structure
- Change Mac notarize from object to boolean (temporarily disabled)
- Replace Windows publisherName with legalTrademarks
- Remove electron-builder install-app-deps from postinstall script

These changes address breaking changes in electron-builder 26.0.12.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: KIvanow

electron-builder.json

@@ -24,9 +24,7 @@
         "arch": ["x64", "arm64"]
       }
     ],
-    "notarize": {
-      "teamId": "UUK47G4BAZ"
-    },
+    "notarize": false,
     "type": "distribution",
     "hardenedRuntime": true,
     "darkModeSupport": true,
@@ -86,7 +84,7 @@
     "target": ["nsis"],
     "artifactName": "Redis-Insight-${os}-installer.${ext}",
     "icon": "resources/icon.ico",
-    "publisherName": ["Redis Inc.", "Redis Labs Inc."]
+    "legalTrademarks": "Redis Inc., Redis Labs Inc."
   },
   "nsis": {
     "oneClick": false,
@@ -117,9 +115,11 @@
     "category": "Development",
     "artifactName": "Redis-Insight-${os}-${arch}.${ext}",
     "desktop": {
-      "Name": "Redis Insight",
-      "Type": "Application",
-      "Comment": "Redis GUI by Redis Ltd"
+      "entry": {
+        "Name": "Redis Insight",
+        "Type": "Application",
+        "Comment": "Redis GUI by Redis Ltd"
+      }
     }
   },
   "deb": {