Claude Enterprise accounts: "missing session data" because spend-limit response has no session windows

[Brandawg93]

Summary

Claude Enterprise accounts fail to display usage in CodexBar with:

Could not parse Claude usage: missing session data

Enterprise plans don't have session-based rate limit windows (five_hour, seven_day, etc.) — they use a single monthly spend limit (e.g., $600/month). The OAuth usage endpoint returns spend data in extra_usage instead of the session window fields, so CodexBar's fallback chain in mapOAuthUsage exhausts and throws.

This is distinct from the previously-fixed five-hour-window omission in #726 / v0.24 — that fix added fallback through seven_day variants, but Enterprise responses have none of those windows.

What the dashboard shows

For reference, the Claude account dashboard renders this Enterprise data correctly:

Your usage limits — Enterprise
$434.43 of $600.00 spent · Spend limit · Resets Jun 1 · 72% used

CodexBar should be able to render the same.

Likely response shape (Enterprise)

{
  "extra_usage": {
    "is_enabled": true,
    "monthly_limit": 600,
    "used_credits": 434.43,
    "utilization": 72,
    "currency": "USD"
  }
  // no five_hour, no seven_day, no seven_day_opus, etc.
}

Root Cause

In ClaudeUsageFetcher.swift:mapOAuthUsage(_:credentials:), the v0.24 fallback chain is:

guard let primary = makeWindow(usage.fiveHour, windowMinutes: 5 * 60)
    ?? makeWindow(usage.sevenDay, windowMinutes: 7 * 24 * 60)
    ?? makeWindow(usage.sevenDayOAuthApps, windowMinutes: 7 * 24 * 60)
    ?? makeWindow(usage.sevenDaySonnet, windowMinutes: 7 * 24 * 60)
    ?? makeWindow(usage.sevenDayOpus, windowMinutes: 7 * 24 * 60)
else {
    throw ClaudeUsageError.parseFailed("missing session data")
}

None of those fields are present for Enterprise responses, so the guard always fails.

Suggested Fix

1. Detect Enterprise plans (via subscriptionType and/or the presence of extra_usage.monthly_limit without any session windows) and render a spend-limit card instead of a session window — mirroring the dashboard's "$X of $Y spent · N% used · Resets ..." display.
2. As a minimum, when no session windows are present but extra_usage is valid, return successfully with the spend data populated rather than throwing missing session data.

Reproduction

1. Use a Claude Enterprise account (long-lived OAuth token via claude setup-token)
2. Set CodexBar Claude Usage source = OAuth API
3. Provider shows "last fetch failed: Could not parse Claude usage: missing session data" despite the API returning valid Enterprise spend data

Environment

• CodexBar 0.25.1 (May 11)
• Claude Code 2.1.128
• Account type: Claude Enterprise with monthly spend limit