refactor(engine): move hud/settings/game/input plugin tests into tests.rs files
Continues #118 after card_plugin (PR #124): the four remaining
oversized plugin files become module directories with their trailing
#[cfg(test)] blocks extracted verbatim into sibling tests.rs files,
following the replay_overlay/ pattern.
hud_plugin: 3,598 -> 2,725 + 872 (44 tests)
settings_plugin: 3,512 -> 2,857 + 654 (25 tests)
game_plugin: 2,562 -> 1,310 + 1,251 (39 tests)
input_plugin: 2,540 -> 1,832 + 707 (31 tests)
Pure mechanical moves via git mv — no runtime code changes; all 139
tests preserved and passing.
Refs #118
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
funman300
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