v2 message format and upgrade to ai sdk v5 (#743)

Co-authored-by: GitHub Action <action@github.com>
Co-authored-by: Liang-Shih Lin <liangshihlin@proton.me>
Co-authored-by: Dominik Engelhardt <dominikengelhardt@ymail.com>
Co-authored-by: Jay V <air@live.ca>
Co-authored-by: adamdottv <2363879+adamdottv@users.noreply.github.com>

packages/web/public/theme.json

@@ -88,14 +88,7 @@
         "syntaxOperator": { "$ref": "#/definitions/colorValue" },
         "syntaxPunctuation": { "$ref": "#/definitions/colorValue" }
       },
-      "required": [
-        "primary",
-        "secondary",
-        "accent",
-        "text",
-        "textMuted",
-        "background"
-      ],
+      "required": ["primary", "secondary", "accent", "text", "textMuted", "background"],
       "additionalProperties": false
     }
   },