refactor(snippets): adopt alias/title model and markdown UX

- rename snippet identity from name to alias and add required title fields

- migrate snippet API, forms, cards, and detail views to alias/title semantics

- render markdown descriptions with short card previews and split vendor chunks

client/src/i18n/locales/en.json

@@ -224,16 +224,20 @@
     "action_cancel": "Cancel",
     "create_title": "New Snippet",
     "edit_title": "Edit Snippet",
-    "form_name": "Name",
-    "form_name_placeholder": "e.g. clickLoginButton",
-    "form_name_required": "Name is required",
+    "form_alias": "Alias",
+    "form_alias_placeholder": "e.g. clickLoginButton",
+    "form_alias_required": "Alias is required",
+    "form_title": "Title",
+    "form_title_placeholder": "e.g. Click Login Button",
+    "form_title_required": "Title is required",
     "form_description": "Description",
     "form_description_placeholder": "What does this snippet do?",
     "form_code": "Code",
     "form_code_placeholder": "await page.click('#login-btn');",
     "form_code_required": "Code is required",
     "field_id": "ID",
-    "field_name": "Name",
+    "field_alias": "Alias",
+    "field_title": "Title",
     "field_description": "Description",
     "field_created": "Created",
     "field_updated": "Updated",