[Col0ring]

Summary

• replace the sidebar running spinner with three pulsing dots labelled as running, with a motion-safe animate-msa-session-dot token
• keep the expanded composer pills open while interacting with them, including their portaled menus, and swap the collapsed toggle to a sliders icon with an expand tooltip
• scope the composer's project MCP and skill lists to the current project, dropping responses for a previous project
• roll back a failed session model save only when no later selection has been made
• size the fork reply icon to the action buttons and format the fork actions
• take provider placeholder initials from any Unicode letter or digit
• exclude build-runtime from the frontend tsconfig

Test

• pnpm typecheck
• pnpm build