* tui: show a ChatGPT account's credits beside its windows
The Usage page printed only the balance for an account that had one, so a
ChatGPT account holding credits lost its 5-hour and weekly windows there.
The balance now follows the windows, as on the app's cards and in
magpie quota.
* accounts: tell a ChatGPT account's credits
magpie accounts left out the credits an account holds, which magpie quota
and the Usage page show. Its rows now carry them, in the line and as
balance in --json.
* codex: a switch for whether an account spends its credits
A ChatGPT account holding credits keeps answering once a usage window is
used up: the vendor spends the credits, and a task goes on. That stays the
default. Each Codex account now has a say in it (Usage card and menu bar
panel: Use credits; magpie quota credits <account> on|off; settings'
codexNoCredits). Turned off, the gateway holds the account at 100% of a
window, as a usage cap holds it at its share, so the other accounts,
groups and fallbacks take the request and no credits are spent. With none
left the request gets a 429 naming what holds each account and how to go
on, unless the account spends its resets by itself and its week is used
up: then a reset is spent first, whether every candidate was held or the
last one tried was refused. A cap set on the account takes precedence.
A reset made now forgets the account's cached allowance, so neither a cap
nor this hold outlives the windows it started again. The switch is
routing's only: which account Codex is signed in to is unchanged.
The Routing page tells why such an account was left out, and magpie quota,
magpie accounts and the TUI mark credits not spent.
* usage: an auto-reset switch keeps by its first line
The auto-reset row centred its switch on its words, so the switch moved
when they rewrapped on a click, and it sat lower than the Use credits
switch beneath it. Both now keep the switch by the first line.
* gui tests: quota-curve expects the Use credits row to close a Codex account's section
The credits switch adds a row after the Auto-use one, so the account after
a Codex account follows the curve, the Auto-use row and then the Use
credits row.
forever
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