Fix buildAndCopyUI and update build instructions (#2036)

Author: Gold856

docs/source/docs/contributing/building-photon.md

@@ -12,7 +12,11 @@ This section contains the build instructions from the source code available at [
 
 **Node JS:**
 
- The UI is written in Node JS. To compile the UI, Node 22.15.0 is required. To install Node JS follow the instructions for your platform [on the official Node JS website](https://nodejs.org/en/download/).
+ The UI is written in Node JS. To compile the UI, Node 22 or later is required. To install Node JS, follow the instructions for your platform [on the official Node JS website](https://nodejs.org/en/download/).
+
+**pnpm:**
+
+ [pnpm](https://pnpm.io/) is the package manager used to download dependencies for the UI. To install pnpm, follow [the instructions on the official pnpm website](https://pnpm.io/installation).
 
 ## Compiling Instructions
 
@@ -197,7 +201,7 @@ Similarly, a local instance of PhotonVision can be debugged in the same way usin
 
 Set up a VSCode configuration in {code}`launch.json`
 
-```
+```json
 {
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.

photon-server/build.gradle

@@ -44,8 +44,13 @@ tasks.register('copyClientUIToResources', Copy) {
     into "${projectDir}/src/main/resources/web/"
 }
 
-tasks.register("buildAndCopyUI") {
-    dependsOn "pnpm_run_build"
+tasks.register('buildClient', PnpmTask) {
+    args = ["build"]
+    dependsOn "pnpmInstall"
+}
+
+tasks.register('buildAndCopyUI') {
+    dependsOn "buildClient"
     finalizedBy "copyClientUIToResources"
 }