Add section-aware 'Create' item to sidebar link context menus

[jbecke]

Motivation

• Provide quick "New ..." actions in the sidebar link context menu so users can create a new document, task, email, folder, agent, or message scoped to the selected sidebar section.
• Reuse existing launcher create flows rather than implementing new creation logic.

Description

• Import runCreateAction from @app/component/Launcher and keep the existing createMenuOpen usage in js/app/packages/app/component/app-sidebar/sidebar.tsx.
• Add a createAction helper that maps props.id (sidebar section ids like documents, tasks, mail, folders, agents, channels) to an action object with text and onClick which calls runCreateAction with the appropriate block type.
• Render a conditional create MenuItem (via <Show when={createAction()}>) appended to the existing context menu entries Open in new split, Open fullscreen, and Open in current split.
• The change adds a contextual menu label (e.g., New document, New task, New email, New folder, New agent, New message) and wires it to existing launcher handlers.

Testing

• Ran type check with bun run check in js/app, which failed in this environment due to missing type definition packages (examples: @types/facebook-pixel, vite/client, wicg-file-system-access).
• No other automated tests were executed in this environment.

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Codex Task

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between de2c248 and 841ad11.

📒 Files selected for processing (1)

• js/app/packages/app/component/app-sidebar/sidebar.tsx

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📝 Walkthrough

Summary by CodeRabbit

New Features

• Sidebar context menu now includes a "create new..." option for supported item types
• Users can quickly create documents, tasks, emails, projects, chats, or channels directly from the sidebar
• Menu option intelligently appears only for compatible link types to streamline navigation

Walkthrough

The sidebar link context menu adds conditional "create new..." menu items based on the clicked link's props.id. A createAction mapping determines appropriate menu labels and routes selections through runCreateAction with specific action types (md, task, email, project, chat, channel). The menu item is only rendered for supported props.id values.

Changes

Cohort / File(s)	Summary
Sidebar Context Menu Enhancement js/app/packages/app/component/app-sidebar/sidebar.tsx	Added conditional "create new..." menu item to sidebar link context menu with createAction mapping for supported action types (md, task, email, project, chat, channel). Menu renders only for matching props.id values via Solid Show guard. Launcher module import updated.

🚥 Pre-merge checks | ✅ 3 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The title does not follow the required conventional commits format (feat:, fix:, chore:, etc.).	Rewrite the title to follow conventional commits format, such as 'feat: Add section-aware Create item to sidebar link context menus' (keeping under 72 characters).

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description is directly related to the changeset, providing clear motivation, implementation details, and testing information.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[github-actions]

Preview: https://codex-add-new-document-task-em-qgkoj3.preview.macro.com/app (2802939)