fix(settings): tolerate missing custom sidebar previews

[teamleaderleo]

The settings package declares Resources/CustomSidebarTemplatePreviews as a copied resource, but current main no longer carries that generated directory after preview art was removed. Every macOS package compile then fails before feature-specific tests run.

Remove the resource declaration. CustomSidebarOnboardingAssets already returns an optional URL, so the settings UI continues to work without bundled previews.

Validated with git diff --check; hosted package and app-host compilation should verify the resource graph.

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Summary by cubic

Fixes macOS package compilation by removing the resource declaration for CustomSidebarTemplatePreviews, a generated directory that no longer exists after preview art was removed.

• The settings UI is unaffected: CustomSidebarOnboardingAssets already returns an optional URL, so it works without bundled previews.

^{Written for commit 0569dcf. Summary will update on new commits.}

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[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 30226ce and 0569dcf.

📒 Files selected for processing (1)

• Packages/macOS/CmuxSettingsUI/Package.swift

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[github-actions]

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[cubic-dev-ai]

No issues found across 1 file

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[teamleaderleo]

Subagent review at 0569dcf: approve. Main has no Resources/CustomSidebarTemplatePreviews, because #16518 deleted it and #16535 re-added only the .copy, so main fails with exit 65. previewImageURL returns URL?, and its only caller (CustomSidebarsSection.swift:352) renders inside if let. No test or project reference depends on the folder. Non-blocking: docs/custom-sidebars.md, Examples/CustomSidebars/README.md and scripts/generate-sidebar-template-previews.py still point at the missing PNGs. The captures PR should restore the .copy together with the images.

[github-actions]

Merge receipt for 0569dcfcd4: every check was green at merge (19 verified; 21 skipped by policy). Full suite runs on main after merge.

[github-actions]

Dogfood tours of 0569dcfc

conversations-sidebar-tour at 0569dcfc: not run

skipped: CI built this head on a runner pool whose products the UI test Macs cannot load, and media never compiles one; gh workflow run pr-media.yml -f pr=<n> -f allow_compile=true does

_{Tours are picked by the paths globs in dogfood/scenarios/*.json; a Dogfood-tours: a, b line in the description picks them instead (none turns this off). Look at every frame before merging: a green tour only means no step failed.}