Show Codex usage percentages as reported

[robinebers]

TL;DR

Show Codex Session, Weekly, and Spark percentages exactly as the usage API reports them. A fresh Session reported as 1% used now remains 1% used / 99% left instead of being rewritten to 0% / Not started.

What was happening

• Codex can report used_percent: 1 for a window that appears fresh.
• OpenUsage used reset timing to reinterpret that value as zero and opted the Codex Session row into a special Not started presentation.
• As reported in Codex Session/Weekly meters flap between real usage and "100% left / Not started" #903, the upstream endpoint can also return inconsistent fresh-looking windows, so the client-side inference could make an unreliable response look authoritative.

What this changes

• Preserve Codex used_percent values verbatim across Session, Weekly, Spark, and Spark Weekly.
• Remove Codex from the special Not started session presentation; Codex rows always use their normal reset label.
• Keep near-empty pacing calm so a reported 1% cannot produce a false red run-out alarm.
• Remove the now-unused fresh-window timing helper and its tests.
• Document that upstream inconsistencies remain visible by design rather than being hidden by client-side caching or correction.

Heads-up

• This intentionally does not add anti-flap caching for Codex Session/Weekly meters flap between real usage and "100% left / Not started" #903. If Codex reports inconsistent values across refreshes, OpenUsage will display those values as received.

Tests

• swift test — 953 passed, 3 skipped, 0 failures.
• Release build, signing, launch, and process verification passed via script/build_and_run.sh verify.

Screenshots

Post-change Codex card showing the API-reported 1% used as 99% left with the normal reset label:

[cursor]

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