Consolidate GUI styling/colors and move domain types to api

[tier940]

No description provided.

[tier940]

/gemini review

[gemini-code-assist]

Code Review

This pull request upgrades the build system to RetroFuturaGradle 2.x and Gradle 9.2.0, reorganizes the package structure to expose a public API surface (including a central BLPCAPI façade), refactors the network layer, and refines the party UI and JourneyMap integration. The code review identified a critical compilation error in BLPCSaveHandler due to missing imports, as well as several potential NullPointerException risks in PartyWidgets, Party, PartyProviderRegistry, PartyQueryUtil, and MembersPanel where null checks are missing.

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[gemini-code-assist]

The classes Files and StandardCopyOption are used here but are not imported in this file, which will cause a compilation error. Since we cannot easily add imports outside the modified diff hunks, please use their fully qualified names to ensure the code compiles successfully.

Suggested change

	try {
	Files.move(tmp.toPath(), finalFile.toPath(), StandardCopyOption.REPLACE_EXISTING);
	} catch (IOException e) {
	try {
	java.nio.file.Files.move(tmp.toPath(), finalFile.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING);
	} catch (IOException e) {