feat(cloud-agent): wire cloud attachments into task creation and session display

[tatoalo]

Problem

The cloud prompt builder and file persistence need to be connected to the UI (file picker, task creation flow) and cloud attachment display in session views.

Changes

• Update AttachmentMenu.tsx: native file picker via selectFiles tRPC, browser file persistence fallback, Tooltip removed (Radix ref loop workaround)
• Update useTiptapEditor.ts: use shared persistImageFile/persistTextContent helpers
• Update useDraftSync.ts: fix attachment clearing with functional setState guard
• Refactor posthogClient.ts: runTaskInCloud options bag replacing positional params
• Update task-creation.ts: build cloud prompt blocks from attached files
• Update buildConversationItems.ts: extract attachments from ACP resource/image blocks
• Update UserMessage.tsx: render attachment badges
• Update service.ts: add TERMINAL_CLOUD_STATUSES const, cloud session improvements
• Update TaskInputEditor.tsx: Tooltip removed (Radix ref loop workaround)

Stack: 3/4 — depends on #1515

[tatoalo]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• feat(cloud-agent): add server-side cloud prompt handling #1517
• feat(cloud-agent): wire cloud attachments into task creation and session display #1516 👈 (View in Graphite)
• feat(cloud-agent): add cloud prompt builder and file persistence #1515
• chore(cloud-agent): extract shared utilities for cloud attachments #1514 : 1 other dependent PR (#1519 )
• main

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[tatoalo]

Recreating with clean branch names