Ask before closing a Workspace tab with unsaved edits #342

Closing a file tab in the Workspace panel throws away edits that are not saved yet (typing from the last moment before autosave, or anything left after a failed save) without asking.

Where to start

1. closeWorkpiece removes the tab without reading the dirty state the panel already tracks (workspaceDirtyRef), and the editor's autosave timer is cleared when the editor unmounts.
2. When the tab has unsaved edits, save first or ask Save / Discard before closing.
3. Pull the close decision into a small pure function and test it.

Code to look at:

• frontend/components/chat/session-view.tsx:595
• frontend/components/chat/workspace-pane.tsx:107
• frontend/app/(library)/agent/artifacts/[id]/artifact-editor-state.ts:418

Done when

• Closing a tab with unsaved edits saves them or asks first.
• Closing a clean tab still closes at once.
• A unit test covers dirty and clean closes.

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