🐛 Bugfix: Disable tool and skill selection when user is not in edit mode

[xuyaqist]

No description provided.

[Copilot]

Pull request overview

This PR aims to prevent users from changing tool/skill selections when they are not in an editable agent context (e.g., no agent selected / not in create mode), by tightening read-only detection and ensuring the Tool management UI relies on the store-derived read-only state.

Changes:

• Update isReadOnly() logic to treat “not creating + no current agent selected” as read-only.
• Remove the isReadOnly prop wiring into ToolManagement and rely on useAgentConfigStore().isReadOnly() directly.
• Minor UI prop change to the Import button in the agent selector header.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
frontend/stores/agentConfigStore.ts	Updates read-only determination to cover the “no agent selected” state.
frontend/app/[locale]/agents/components/AgentSelectorHeader.tsx	Removes type="text" from the Import button.
frontend/app/[locale]/agents/components/AgentConfigComp.tsx	Stops passing isReadOnly into ToolManagement.
frontend/app/[locale]/agents/components/agentConfig/ToolManagement.tsx	Simplifies read-only handling to always use the store value.

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