web: implement settings core

this was a torture

web/package-lock.json

@@ -11,7 +11,8 @@
             "dependencies": {
                 "@fontsource-variable/noto-sans-mono": "^5.0.20",
                 "@fontsource/ibm-plex-mono": "^5.0.13",
-                "@tabler/icons-svelte": "^3.6.0"
+                "@tabler/icons-svelte": "^3.6.0",
+                "ts-deepmerge": "^7.0.0"
             },
             "devDependencies": {
                 "@eslint/js": "^9.5.0",
@@ -3048,6 +3049,15 @@
                 "typescript": ">=4.2.0"
             }
         },
+        "node_modules/ts-deepmerge": {
+            "version": "7.0.0",
+            "resolved": "https://registry.npmjs.org/ts-deepmerge/-/ts-deepmerge-7.0.0.tgz",
+            "integrity": "sha512-WZ/iAJrKDhdINv1WG6KZIGHrZDar6VfhftG1QJFpVbOYZMYJLJOvZOo1amictRXVdBXZIgBHKswMTXzElngprA==",
+            "license": "ISC",
+            "engines": {
+                "node": ">=14.13.1"
+            }
+        },
         "node_modules/tslib": {
             "version": "2.6.3",
             "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.6.3.tgz",