fix(task-input): stop composer flicker on long multi-line prompts

[fercgomes]

Summary

The "New task" composer flickered — bouncing up and down by one line — when typing a long, multi-line prompt. The column was wrapped in a framer-motion <motion.div layout> with a 250ms transition, so each new Tiptap line triggered a layout animation; rapid keystrokes interrupted each other and produced a visible one-line oscillation.

• Replace the <LayoutGroup> + <motion.div layout> wrapper with a plain <div> so the editor grows instantaneously.
• Drop the now-unused framer-motion import.
• The suggestions panel below already handles its own enter/exit transitions via its internal AnimatePresence, so no animation is lost.

Screen.Recording.2026-05-21.at.16.21.31.mov

Test plan

• pnpm dev:code, open New task, type a prompt long enough to wrap to ~5 lines — composer grows smoothly with no flicker.
• Type past max-h-[45vh] — inner scroll engages cleanly.
• Delete content back to one line — composer shrinks smoothly.
• Trigger discovery so SuggestedTasksPanel shows entries below the editor, then type — suggestions don't flicker and don't push the editor around.

[greptile-apps]

_{Reviews (1): Last reviewed commit: "fix(task-input): stop composer flicker o..." | Re-trigger Greptile}