feat: integrate Google semantic search and branded desktop launcher

tools/embeddinggemma2/model-manifest.json

@@ -0,0 +1,15 @@
+{
+  "model_id": "google/embeddinggemma-2",
+  "export_repository": "ggml-org/embeddinggemma-2-GGUF",
+  "revision": "bfcd298762cc34d0357ece5ebdd31791a3a374d8",
+  "dimensions": 768,
+  "quantization": "Q8_0",
+  "license": "Apache-2.0",
+  "runtime_tag": "b11461",
+  "query_prefix": "task: search result | query: ",
+  "document_template": "title: {title} | text: {text}",
+  "files": [
+    {"path":"embeddinggemma-2-Q8_0.gguf","bytes":309855456,"sha256":"2188ac1deca4b77dffefd603c2776a9d76d9d74ec01841392982ebb840b09135"},
+    {"path":"mmproj-embeddinggemma-2-Q8_0.gguf","bytes":554821024,"sha256":"c4a8a52691ecef40618438928bdf9e68379b854e24166f292592353db0aab64f"}
+  ]
+}