fix: center files state and suppress emojis

[iamjr15]

Summary

• Centers the Files empty-state mark within the editor surface instead of the full iframe viewport, so the explorer width no longer shifts it left.
• Strengthens the agent narration contract so user-visible responses omit emojis unless the user explicitly requests them.

Decisions Made

Decision	Choice	Reasoning
Empty-state positioning	Absolute positioning inside the editor empty-state container	The container already owns the editor bounds; viewport-fixed positioning incorrectly included the explorer pane.
Emoji handling	System-prompt invariant with explicit rewriting guidance	Covers headings, status lines, templates, skills, and sourced content without changing rendering behavior.

Edge Cases Handled

Scenario	Handling
Explorer width changes	The mark remains centered against the editor pane.
Skill or template contains emoji	The agent rewrites it to plain text unless emojis were requested.

How to Review

1. Review packages/preview-bridge/src/index.ts for the positioning scope.
2. Review packages/agent-core/src/mastra/system-prompt.ts for the response-style invariant.

Validation

• pnpm lint
• pnpm turbo typecheck
• pnpm build
• Direct agent-browser QA in the embedded Files tab with an empty folder
• Direct agent-browser QA of a fresh celebratory response; zero Extended_Pictographic characters
• Browser console checked with no new application errors

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
cheatcode	Ignored		Jul 20, 2026 5:46am