bug: spark usage limited when global usage limited

What issue are you seeing?

When there is GPT-5.3-Codex-Spark usage left and the Global weekly limit is reached, it is impossible to use GPT-5.3-Codex-Spark with the following error: You've hit your usage limit.

From /status:

│  Context window:              47% left (142K used / 258K)                              │
│  5h limit:                    [████████████████████] 100% left (resets 18:25)          │
│  Weekly limit:                [░░░░░░░░░░░░░░░░░░░░] 0% left (resets 13:43 on 28 Apr)  │
│  GPT-5.3-Codex-Spark limit:                                                            │
│  5h limit:                    [████████████████████] 100% left (resets 19:30)          │
│  Weekly limit:                [████████████████████] 100% left (resets 14:30 on 4 May) │
│  premium limit:                                                                        │
╰────────────────────────────────────────────────────────────────────────────────────────╯

What steps can reproduce the bug?

1. Hit global usage limit
2. Switch model to GPT-5.3-Codex-Spark
3. Send prompt

What is the expected behavior?

I should be able to continue using spark still when the general, global weekly usage window is fully consumed.

Additional information

_No response_