Add windsurf support

[mphassani]

Summary

Adds a new Windsurf provider (local-only usage tracking, similar to Antigravity’s local probe model)

Changes

• Windsurf provider

  • New provider descriptor + local fetch strategy reading Windsurf’s VS Code-style SQLite DB: ~/Library/Application Support/Windsurf/User/globalStorage/state.vscdb
  • Parses ItemTable key windsurf.settings.cachedPlanInfo and displays up to three meters: Messages, Flow Actions, Flex Credits, using endTimestamp as reset
  • This is intentionally in the same spirit as Antigravity: a local-only provider that reads on-disk state (no cookies/network) and maps it into CodexBar’s standard meters
  • Adds provider branding + ProviderIcon-windsurf.svg
  • Docs: docs/windsurf.md, plus updates to README.md, docs/providers.md, docs/configuration.md

• Misc

  • Update provider lists/switches (CLI provider selection tests, provider IDs, icon resource tests)
  • Widget: add Windsurf label/color, but keep it disabled for widget selection for now (“not yet supported in widgets”)

Testing

• Recommended locally: ./Scripts/compile_and_run.sh (or swift test).

Notes

• Windsurf DB path override for debugging/tests:
  • CODEXBAR_WINDSURF_STATE_DB=/absolute/path/to/state.vscdb (or WINDSURF_STATE_DB=...)