[austinywang]

Custom JavaScript sidebars can already write the system clipboard through the gesture-gated clipboard.write(text) API from #19333, but their workspace context still has no separate emoji value. This adds an optional workspaces[i].emoji field derived from the display title's leading emoji grapheme, while preserving the full title value for existing sidebars.

The value travels through the typed workspace snapshot, is omitted when no leading emoji is present, and is covered by projection tests and the custom-sidebar contract documentation.

Closes #18988

Verification

• python3 scripts/localize-changes (passed; no localization keys changed)
• python3 scripts/localization_catalog.py check (passed)
• python3 scripts/verify-local.py --only test-wiring (passed)
• Swift package tests and syntax parsing were not run locally because this checkout has no swiftc/Swift toolchain; CI should execute CustomSidebarDataContextBuilderTests.

Changelog

Added

• Expose a leading workspace emoji in custom sidebar workspace data.

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Summary by cubic

Adds an optional workspaces[i].emoji field to the custom sidebar data context, derived from the leading emoji grapheme of the workspace display title. Sidebars using the full title value are unaffected, and the field is omitted when no leading emoji exists. Closes #18988.

New Features

• Derives the emoji from the first grapheme of the display title and omits it when the title doesn't start with an emoji-presentation character.
• Updates CustomSidebarWorkspaceSnapshot with the optional emoji property and documents the new field in docs/custom-sidebars.md.

^{Written for commit c72fdff. Summary will update on new commits.}

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📥 Commits

Reviewing files that changed from the base of the PR and between 9d01f95 and c72fdff.

📒 Files selected for processing: 5

• Packages/macOS/CmuxSidebar/Sources/CmuxSidebar/Layout/CustomSidebarDataContextBuilder.swift
• Packages/macOS/CmuxSidebar/Sources/CmuxSidebar/Layout/CustomSidebarWorkspaceSnapshot.swift
• Packages/macOS/CmuxSidebar/Tests/CmuxSidebarTests/CustomSidebarDataContextBuilderTests.swift
• Sources/Workspace+CustomSidebarSnapshot.swift
• docs/custom-sidebars.md

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[github-actions]

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[github-actions]

Dogfood tours of c72fdff9

sidebar-and-chrome-tour at c72fdff9: 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.}

[austinywang]

Closeout verification update:\n\n- The PR head matches the verified local and remote branch head.\n- The PR is open, non-draft, mergeable, and clean.\n- Required checks are green or intentionally skipped.\n- No unresolved review threads remain.\n\nThis PR is ready for review. No merge was performed.

[github-actions]

Merge receipt for c72fdff9fa: every check was green at merge (20 verified; 21 skipped by policy). Full suite runs on main after merge.