DeepSeek Harness Plugin: dsh-nexus-usage-panel, Bringing the Fireworks Nexus usage panel into the Web GUI

Maintained by bradywatkinson, this plugin is a panel plugin for the DeepSeek Harness Web GUI (Category: Internet Tools). It reads the same set of private REST APIs used by the Nexus desktop app (nexusPlans, nexusPlanUsage, usageCosts:query, usageSavings:query). It replicates the Nexus Overview card on the Settings → Nexus Usage page: plan tier, percentage used this month and reset date, and percentage used in the current session with reset time, and additionally provides a breakdown of costs by model, estimated savings, and cache hit lines. When model attribution is lagging, it falls back to real-time daily cost trends (GitHub-style contribution grid or daily table, selectable and persisted to ~/.dsh/nexus-usage-panel.json). The key is retrieved from the macOS login keychain (service FireworksAI / account fireworks-api-key), and this plugin is available only on macOS.