[SDK] Fix: Process undefined checks in vite (#7844)

<!--

## title your PR with this format: "[SDK/Dashboard/Portal] Feature/Fix: Concise title for the changes"

If you did not copy the branch name from Linear, paste the issue tag here (format is TEAM-0000):

## Notes for the reviewer

Anything important to call out? Be sure to also clarify these in your comments.

## How to test

Unit tests, playground, etc.

-->

<!-- start pr-codex -->

---

## PR-Codex overview
This PR addresses the resolution of the SDK in environments where `process` is undefined, ensuring that the checks for development and test environments are more robust.

### Detailed summary
- Updated the `IS_DEV` constant to check if `process` is defined before accessing its properties.
- Modified the `IS_TEST` constant similarly to ensure it only evaluates when `process` is defined.

> ✨ Ask PR-Codex anything about this PR by commenting with `/codex {your question}`

<!-- end pr-codex -->

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

* **Bug Fixes**
  * Guarded environment checks to avoid runtime errors where Node globals are absent, improving stability across browsers, serverless, and edge runtimes.
  * More reliable detection of development and test modes, reducing unexpected crashes during bundling, CI testing, and client-side use.

* **Chores**
  * Added release metadata so the fix will be published as a patch.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: gregfromstl

.changeset/fine-zoos-own.md

@@ -0,0 +1,5 @@
+---
+"thirdweb": patch
+---
+
+Fix SDK resolution in environements where process is undefined

packages/thirdweb/src/utils/process.ts

@@ -1,5 +1,10 @@
+// You must use typeof process !== "undefined" instead of just "process"
 export const IS_DEV =
-  process &&
+  typeof process !== "undefined" &&
+  process.env &&
   (process.env.NODE_ENV === "development" || process.env.NODE_ENV === "test");
 
-export const IS_TEST = process && process.env.NODE_ENV === "test";
+export const IS_TEST =
+  typeof process !== "undefined" &&
+  process.env &&
+  process.env.NODE_ENV === "test";