[Claudesaul]

Problem

On iOS, tapping New thread makes the "What should we build" text jump up as the screen finishes sliding in. On an iPhone it moved about 29pt on every open.

Change

The text was centered between the header and the composer, and both change size during the slide. It now sits 30% down the space above the keyboard, so neither can move it. It still rises with the keyboard and stays below the header.

Scope and approval

Small fix for an obvious bug on one screen. I found no issue or PR covering it.

Verification

• iOS 27 simulator, iPhone 18 Pro Max: before, the text lands at 328pt and jumps to 312pt. After, it stays at 316pt from the first frame.
• The simulator measures the composer too fast for the jump to show after the slide, so both takes hold that measurement back 350ms. That delay isn't in this PR.
• A tall composer now covers the text instead of pushing it up.
• vp run check:changed passes.
• Not checked: a real iPhone, iPad, Android and the software keyboard.

Recording at half speed: tapping New thread.

Before	After

Model: Claude Opus 5.5; harness: T3 Code.