fix(macOS): resolve platform-specific lint failures

[kaluli123123]

Summary

• Guard macOS-only unused imports after the repository's otty/ to app/ reorganization.
• Consume the macOS-only resize direction binding explicitly.
• Keep the non-macOS resize behavior unchanged.

The settings tests originally included in this PR are already fixed on main, so the current diff contains only the remaining macOS lint fixes.

Verification on macOS

• cargo +nightly fmt: passed.
• cargo clippy --workspace --all-targets --all-features -- -D warnings: passed.
• cargo deny check: exited 0 with the existing yanked core2 0.4.0 and spin 0.9.8 warnings.
• cargo test --workspace --all-features: 526 passed, 2 ignored.
• cargo llvm-cov --workspace --all-features --fail-under-lines 80: exited 1 because workspace line coverage is 67.73%.

Before the fix, workspace clippy failed on macOS with the unused resize_grips import, unused window import, and unused dir binding.

[kaluli123123]

@kemokempo Could you please review and merge this PR before #89? All seven checks pass, the PR is mergeable, and #89 is intentionally stacked on this head so its lint job remains green. After #87 lands, GitHub will remove the two app files from #89's effective diff.

[kemokempo]

@kemokempo Could you please review and merge this PR before #89? All seven checks pass, the PR is mergeable, and #89 is intentionally stacked on this head so its lint job remains green. After #87 lands, GitHub will remove the two app files from #89's effective diff.

I think you need to rebase with main first

[kaluli123123]

Rebased both branches onto the current main with linear history. #87 now points directly to one commit on dab418d, and #89 is stacked linearly on #87. The resulting file trees are unchanged; CI is rerunning on the rewritten heads.