chore(code): add prompt sent event to cloud tasks

[adboio]

Problem

this is not 100% accurate because we only track "prompt sent" for local tasks https://us.posthog.com/project/2/insights/9A5loOF4

Changes

adds "prompt sent" event to cloud tasks

How did you test this?

Automatic notifications

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

[adboio]

• chore(code): add prompt sent event to cloud tasks #2532 👈 (View in Graphite)
• main

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[github-actions]

React Doctor found no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit c552a27.}

[greptile-apps]

Prompt To Fix All With AI

Fix the following 1 code review issue. Work through them one at a time, proposing concise fixes.

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### Issue 1 of 1
apps/code/src/renderer/sagas/task/task-creation.ts:325
**`prompt_length_chars` measurement differs from local tracking**

`transport.promptText` is `buildCloudTaskDescription` output, which appends `"Attached files: file1, file2, …"` when files are present. For a file-only cloud prompt (no text body), `messageText` is `undefined` but `promptText` is a non-empty attachment summary, so `prompt_length_chars` will report a non-zero length for what is effectively an empty text prompt. The local equivalent uses only the pure text (`extractPromptText`), so the two paths are inconsistent. Using `transport.messageText?.length ?? 0` would match the local meaning; if tracking files-sent information matters, a separate `has_attachment` property on `PromptSentProperties` would be cleaner than relying on the length signal.

_{Reviews (1): Last reviewed commit: "chore(code): add prompt sent event to cl..." | Re-trigger Greptile}