fix(code): show user's cloud-only tasks in desktop sidebar

[joshsny]

Problem

Tasks triggered via Slack (or any other cloud-only path) didn't appear in the
desktop sidebar until the user opened them in the web UI first — at which
point a local workspace got created as a side effect and the task suddenly
showed up.

The mobile app doesn't have this papercut because it lists tasks via
getTasks({ createdBy: <me> }). The desktop instead only fetched task
summaries for IDs it already knew about locally — local workspaces, pins,
or in-flight provisioning — and gated visibility on the same set:

// apps/code/src/renderer/features/sidebar/hooks/useSidebarData.ts
rawTasks.filter(
  (task) =>
    !archivedTaskIds.has(task.id) &&
    (showAllUsers ||
      showInternal ||
      !!workspaces?.[task.id] ||
      provisioningTaskIds.has(task.id)),
)

A Slack-launched cloud run is created server-side, has no local workspace on
the user's machine, and isn't in any of the other local sets — so it failed
the filter (and wasn't even fetched in the first place).

Changes

In useSidebarData:

• Always fetch the user's own tasks via useTasks({ showAllUsers: false })
  (which already passes createdBy: <me>), enabled whenever we know the
  current user.
• Merge those into rawTasks alongside the existing workspace/pin/provisioning
  summaries, deduped by id. Summary IDs that overlap with the user's task list
  are dropped from the summaries fetch so we don't request the same task twice.
• Admit user-created tasks past the sidebar filter.
• The showAllUsers (dev) and showInternal (staff) toggles keep using the
  full /tasks/ list as before.

How did you test this?

• pnpm --filter=@posthog/code typecheck — no new errors in the changed file
  (the pre-existing missing-@posthog/git / @posthog/platform package errors
  are unrelated and present on main).
• Biome check clean on the changed file.

Manual verification still pending — would appreciate a quick end-to-end check
of:

1. Trigger a task from Slack while desktop is open → it should now appear in
   the sidebar without first opening the web UI.
2. Existing local-workspace tasks created by collaborators still show up.
3. The showAllUsers and showInternal (staff/dev) toggles behave as before.

Publish to changelog?

no

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