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Composer add-assets plate for the DeepSeek Harness Web Client: an options menu on the composer's + button (files, folders, slash commands) and a Claude Code-style draft attachment preview

Adds a file-picker 'attach image' button to the composer toolbar, since DSH's own web client only supports paste and drag-and-drop for image attachments (v1 scope, per its own upstream design notes) - a real gap for touch devices with no drag-and-drop and