Bugfix: when user login or register, do not open session expire modal

[xuyaqist]

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[Copilot]

Pull request overview

This PR fixes a UX bug where the session-expired modal could pop over an in-progress login/register flow, and tightens the BFF refresh-token handling. It also makes minor adjustments to agent config UI: read-only handling when no agent is selected, copy updates for the new top-of-page agent selector, and a couple of small UI cleanups in AgentSelectorHeader / ToolManagement.

Changes:

• Suppress the session-expired modal (and re-bind the listener with current modal state) while the login/register modal is already open; short-circuit /api/user/refresh_token in server.js with a 401 when no refresh-token cookie is present.
• Treat "no agent selected and not in create mode" as read-only in the agent config store, and drop the redundant isReadOnly prop path from ToolManagement / AgentConfigComp.
• Update zh/en translations from "left panel" to "top panel" and remove type="text" from the Import button to visually match the New button.

Reviewed changes

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Show a summary per file

File	Description
frontend/hooks/auth/useAuthenticationUI.ts	Guard the session-expired handler when login/register modal is open and add the modal flags to the effect deps.
frontend/server.js	Return 401 immediately from the BFF when the refresh-token cookie is missing, and bail out of forwarding.
frontend/stores/agentConfigStore.ts	Make isReadOnly return true when no agent is selected and not in create mode.
frontend/app/[locale]/agents/components/agentConfig/ToolManagement.tsx	Remove the isReadOnly prop and rely solely on the store selector.
frontend/app/[locale]/agents/components/AgentConfigComp.tsx	Stop passing the now-removed isReadOnly prop into ToolManagement.
frontend/app/[locale]/agents/components/AgentSelectorHeader.tsx	Drop type="text" on the Import button so it matches the New button styling.
frontend/public/locales/en/common.json	Update copy from "left panel" to "top panel" for the no-agent-selected hint.
frontend/public/locales/zh/common.json	Same copy change in Chinese.

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