Disable clipboard on Android to fix a compile error

[Nikitf777]

The arboard dependency prevents this project from compiling for Android (e.g. in Termux). This PR disables this dependency and all the related functionality (clipboard support) when compiling for Android.
Tested on my own Android device in Termux.

[greptile-apps]

Confidence Score: 5/5

Safe to merge: Android dependency resolution no longer includes arboard, and the supported host build compiles successfully.

What we checked:

• Compared Android dependency resolution before and after this change; the pre-change revision resolves arboard 3.6.1 while the PR revision resolves no arboard package for Android.
• Attempted narrow Android compilation on both revisions; both attempts halted at the same missing Android NDK compiler before reaching the changed crate.
• Completed the jcode-tui host compilation without default features.
• Captured the before/after Android resolution states; pre-capture shows arboard 3.6.1 resolved and post-capture shows the PR's Android-resolved arboard set is empty.
• Both narrow Android checks stop at the same unavailable NDK compiler, so the changed fallback paths could not be compiled for Android in this environment.

Summary

No blocking issues were identified.

The change removes arboard from Android dependency resolution while preserving its use on supported platforms. Host compilation completed successfully.

T-Rex validation blocked

• Full Android compilation could not proceed because the environment lacks aarch64-linux-android-clang, which is required before compilation reaches jcode-tui.

_{Reviews (1) · Last reviewed commit: "Disable clipboard on Android to fix a co..."}