fix(core): preserve multi-line caret navigation in ChatComposerInput

[Lee-Dongwook]

Related Issue

#4282

Summary

Fixes ChatComposerInput message-history navigation so ArrowUp and ArrowDown only recall history when the caret is at the relevant text
boundary.

This preserves the browser’s default vertical caret movement within multi-line drafts.

Changes

• Recall the previous message with ArrowUp only when the selection is at the start of the draft.
• Move forward through message history with ArrowDown only when the selection is at the end of the draft.
• Preserve repeated history navigation when a recalled message is fully selected.
• Restore the pending draft after navigating past the newest history entry.
• Add selection-boundary helpers for contenteditable composer input.
• Add a patch changeset for @astryxdesign/core.

Tests

Added coverage for:

• ArrowUp recall at the start of a draft
• Default ArrowUp behavior when the caret is mid-text, including multi-line content
• Forward/backward history navigation
• Pending-draft restoration
• Empty history and hasHistory={false}

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Project	Deployment	Actions	Updated (UTC)
astryx	Ready	Preview, Comment	Jul 24, 2026 1:03pm