fix(tasks): restore context menu for pinned tasks

[MattPua]

Problem

Right-clicking on pinned tasks in the sidebar no longer opens the context menu, preventing users from accessing task options after pinning.

Changes

• SidebarMenu.tsx: Refactored task lookup logic to fall back to allSidebarTasks when taskMap doesn't contain the task. Pinned tasks may not be in taskMap, so we now check allSidebarTasks as a fallback to ensure taskData is always available when needed.
• useTaskContextMenu.ts: Relaxed the task parameter type from Task to Pick<Task, "id" | "title"> to accommodate partial task objects, allowing the context menu to work with pinned tasks that may only have basic properties available.

How did you test this?

Manual testing of right-click context menu on pinned tasks in the sidebar.

Automatic notifications

• Publish to changelog?
• Alert Sales and Marketing teams?

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[github-actions]

React Doctor found no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit 1a6eeb2.}

[github-actions]

Trivial UI fix: reorders variable declarations to provide a fallback for tasks not in taskMap, and relaxes the context menu hook's param type accordingly. No logic change, no data model impact.

[greptile-apps]

_{Reviews (1): Last reviewed commit: "fix(tasks): restore context menu for pin..." | Re-trigger Greptile}