feat: add file drag-and-drop infrastructure to chat textarea #132
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Implements HTML5 drag-and-drop event handling for the chat textarea, extracting file metadata (name, size, type, path) and logging to console. This validates the drag-drop mechanic works in the Electron/Replicant environment before committing to state architecture or provider integration. Follows established patterns with Nexus placeholders for DataTransfer extraction and pure actions that return effect descriptions.