fix(cli): support sketches with custom main file names by avinxshKD · Pull Request #1329 · processing/processing4

Previously, the CLI only accepted sketches where the main .pde file
matched the sketch folder name (e.g., sketch/sketch.pde). This caused
issues when users renamed their main file in the IDE, which stores
the custom filename in sketch.properties.

Now the CLI checks sketch.properties for a 'main' property before
falling back to the default naming convention, matching the IDE's
behavior implemented in Sketch.findMain().

Fixes processing#1219

Added testSketchWithCustomMainFile() to CLITest.kt as requested by maintainer. This test provides a placeholder for manual testing of sketches with custom main files specified in sketch.properties.

Follows the same pattern as existing CLI tests (testLSP, testLegacyCLI) and is intended to be run manually in IntelliJ IDEA.

Converted testSketchWithCustomMainFile() from manual to automated test. Now creates a temporary sketch folder with custom main file and sketch.properties, then tests the CLI build command.

Follows the pattern from SchemaTest.kt using Files.createTempDirectory() and automatic cleanup.