fix(mobile): support dragged images in the composer

[t3dotgg]

Dragging an image over the iOS composer did not add it to the draft. UIKit could only attempt to insert it as rich text, which the controlled composer cannot represent.

The iOS editor now claims image drops through UITextDropDelegate and forwards their item providers through the existing image attachment path. Non-image drops keep UIKit’s suggested behavior.

Tests:

• vp test run apps/mobile/src/lib/composerImages.test.ts
• vp run --filter @t3tools/mobile typecheck

Built by gpt-5.6-sol with the Codex harness in T3 Code.

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Note

Low Risk
Scoped to iOS composer drag handling and reuses the existing paste image pipeline; no auth, data model, or cross-platform behavior changes beyond fixing image drops.

Overview
iOS composer now handles dragged images the same way as paste, so drafts can pick up images from drag-and-drop instead of UIKit trying to insert rich-text attachments the controlled value cannot represent.

T3ComposerEditorView adopts UITextDropDelegate and sets textView.textDropDelegate. For drops whose session items are all image providers, proposalForDrop returns a copy/insert/delegate proposal so UIKit does not insert NSTextAttachment into the text view. willPerformDrop forwards those providers to ComposerTextView.loadImages, which writes temp PNGs and fires onComposerPasteImages—unchanged from the paste path. loadImages is no longer private so the drop delegate can call it. Mixed or non-image drops still use UIKit’s suggested proposal.

^{Reviewed by Cursor Bugbot for commit d85134f. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Support dragged images in the mobile composer

Adds UITextDropDelegate conformance to T3ComposerEditorView in T3ComposerEditorView.swift so image drops into the text composer are handled natively on iOS.

• When all dropped items are images, the view returns a .copy/.delegate drop proposal and loads them via textView.loadImages(from:) instead of letting UIKit insert attachments.
• Non-image drops fall back to UIKit's suggested proposal.
• ComposerTextView.loadImages access level is widened from private to internal to allow this call.

^{Macroscope summarized d85134f.}

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[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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[macroscopeapp]

Approvability

Verdict: Approved d85134f

This PR adds drag-and-drop image support to the iOS composer by implementing the standard UITextDropDelegate protocol and reusing the existing image loading method. The change is self-contained to the mobile composer module with no impact outside this input handling enhancement.

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