fix(cli): support sketches with custom main file names

[avinxshKD]

Problem

CLI rejected sketches with custom main file names (e.g., sketch/main.pde) even though the IDE supports them via sketch.properties.

Solution

Updated CLI to check sketch.properties for a main property before falling back to default naming, matching IDE behavior from Sketch.findMain().

Changes

• Commander.java: Added Settings import and custom main file detection logic
• CommanderTest.java: Added unit tests for default and custom main file handling

Fixes #1219

[avinxshKD]

@Stefterv, kindly review this too when you get a chance

[Stefterv]

Hi @avinxshKD the code looks great to me, the tests however could use some work. Could you please create a test that tests the actual issue? See https://github.com/processing/processing4/blob/main/app/test/processing/app/CLITest.kt on how to write tests for the Command Line Interface!

[avinxshKD]

Hi @avinxshKD the code looks great to me, the tests however could use some work. Could you please create a test that tests the actual issue? See https://github.com/processing/processing4/blob/main/app/test/processing/app/CLITest.kt on how to write tests for the Command Line Interface!

Hi @Stefterv, thank you for the feedback! I've made the following updates:

1. Added CLI test to CLITest.kt as requested - testSketchWithCustomMainFile() follows the same pattern as existing tests and provides instructions for manual testing in IntelliJ IDEA.

The CLI test is ready for manual verification once you have a chance to test with a sketch that has a custom main file in sketch.properties.

[Stefterv]

Hi @avinxshKD please see here on how to create a temporary directory and temporary sketch so this does not need to be a manual test. We do not do any manual testing unfortunately

processing4/app/test/processing/app/SketchbookTest.kt

Lines 16 to 23 in ef226c9

	val directory = createTempDirectory("scaffolding")
	val sketchbook = directory.resolve("sketchbook")
	sketchbook.toFile().mkdirs()
	val sketchbookAbs = sketchbook.toAbsolutePath().toString()
	System.setProperty("processing.sketchbook.folder", sketchbookAbs)
	val result = Base.getSketchbookFolder()
	assertEquals(sketchbookAbs, result.absolutePath)

[avinxshKD]

Hi @Stefterv, thank you for the guidance I've updated the test to be fully automated as requested