fix(swift-ios): keep caret after command completion

[mackinleysmith]

What Changed

Selecting a skill or slash command in the SwiftUI composer could leave the caret at the old trigger endpoint. Continuing to type then inserted text inside the completed command.

The composer now computes the target offset from the original draft, publishes the replaced text, and only then sends the one-shot selection request.

Why

SwiftUI can update the UIKit representable between the two state writes. Publishing the selection request first allowed it to be applied and clamped against the shorter pre-replacement text, then marked as consumed.

UI Changes

No visual styling changed.

Before, completing $file as $file-pr could leave the caret after $file. After, the caret lands after the completed token and its trailing space.

Verified on a physical iPhone 14 Pro with T3 Swift Dev.

Verification

• T3CodeTests/FeatureComposerPowerTests: 25 passed
• Physical iPhone 14 Pro: skill and command completion keeps subsequent typing after the inserted token

Checklist

• This PR is small and focused
• I explained what changed and why
• No visual styling changed
• The interaction change was verified on a physical device

Built with gpt-5.6-sol at xhigh reasoning effort in the T3 Code Codex harness.

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Note

^{Cursor Bugbot is generating a summary for commit 39a4d5e. Configure here.}

Note

Fix caret placement after command completion in FeatureComposerView

Reorders the trigger insertion handler in FeatureComposerView.swift to publish textSelectionRequest after updating the text. This prevents the cursor from being clamped against the pre-replacement draft content.

^{Macroscope summarized 39a4d5e.}

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[macroscopeapp]

Approvability

Verdict: Approved at 39a4d5e

Macroscope's review found this PR approvable — This is a narrowly scoped Swift iOS bug fix that reorders two existing state updates so command completion places the caret after the inserted text. It changes no schemas, integrations, infrastructure, or sensitive code and has a limited component-level impact.

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