Improve app build time: parallel builds and task deduplication

[Copilot]

buildAll ran Android, iOS, and Library builds sequentially, and IsDependentOn declarations were never actually resolved — making dotnet restore a no-op dependency.

TaskRunner.csx — deduplication + dependency resolution

• RunAsync now uses ConcurrentDictionary<string, Task>.GetOrAdd so each task executes at most once per session, even under concurrent callers
• Dependencies declared via IsDependentOn are now resolved and awaited before the task body runs (multiple deps run in parallel via Task.WhenAll)

build.csx — parallel builds + correct iOS project

• buildAll now fans out with Task.WhenAll instead of sequential RunAsync(string[]) — Android, iOS and Library builds run concurrently; init (restore) runs exactly once before all three proceed
• Fixed buildiOS to target ComponentsPath (the Components app) instead of LibraryPath — consistent with buildAndroid and packageiOS

// Before
await TaskRunner.RunAsync(new[] { "buildAndroid", "buildiOS", "buildLibrary" }, false);

// After — init runs once, then all three build in parallel
await Task.WhenAll(
    TaskRunner.RunAsync("buildAndroid"),
    TaskRunner.RunAsync("buildiOS"),
    TaskRunner.RunAsync("buildLibrary")
);

Todos

• I have tested on an Android device.
• I have tested on an iOS device.
• I have supported accessibility

Original prompt

Can you improve our app build time, look at the build folder to see how we build our apps.

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