sync: port upstream composer image upload wire format (#4035)

[aaditagrawal]

What changed

• Ports upstream #4035: send composer images in upload wire format (toUploadChatImageAttachments) from mobile startTurn and outbox drain.
• Preserves fork: n/a (narrow mobile wire-format strip).

Validation

• composerImages.test.ts 4/4 passed in port worktree
• Tip stack: vp check and vp run typecheck passed

Stack: 3 of 6; depends on #161.

[aaditagrawal]

• sync: port upstream real-route app store screenshot harness (#4014) #165
• sync: port upstream native mobile share target support (#4021) #164
• sync: port upstream iOS terminal Enter input encoding (#4043) #163
• sync: port upstream composer image upload wire format (#4035) #162 👈 (View in Graphite)
• sync: port upstream fix for dropped events during thread snapshot (#4079) #161
• sync: port upstream CLAUDE_CONFIG_DIR for Claude instances (#4017) #160
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

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Configuration used: defaults

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Run ID: 53cb20cb-7c53-4b3f-b379-2102384a99c7

📥 Commits

Reviewing files that changed from the base of the PR and between b3275dc and d2ae0d8.

📒 Files selected for processing (4)

• apps/mobile/src/lib/composerImages.test.ts
• apps/mobile/src/lib/composerImages.ts
• apps/mobile/src/lib/projectThreadStartTurn.ts
• apps/mobile/src/state/use-thread-outbox-drain.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sync/20260717-composer-images

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[aaditagrawal]

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[aaditagrawal]

Merge activity

• Jul 17, 10:56 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Jul 17, 11:00 AM UTC: Graphite rebased this pull request as part of a merge.
• Jul 17, 11:00 AM UTC: @aaditagrawal merged this pull request with Graphite.