Copy Link feature designed

specs/006-copy-link-feature/data-model.md

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+# Data Model: Copy Link Feature
+
+This feature primarily operates on existing frontend data structures and browser APIs. The key entity involved is:
+
+## Session
+
+- **Description**: Represents an active user session within the frontend application.
+- **Attributes relevant to this feature**:
+    - `url`: The unique URL of the current session, which is to be copied to the clipboard.
+- **Relationships**: None directly introduced or modified by this feature.