feat: add a pace indicator to the usage bars

[carlosresu]

Summary

Adds an opt-in pace indicator that marks where usage should be if spread evenly across the window, so each bar shows at a glance whether you can keep working or are about to run out. Rebased on v1.4.8 and extended to the Antigravity model.

• The expected position is derived from each section's resets_at and the fixed window length (5h / 7d).
• Green — behind pace: headroom to ramp up before the window resets.
• Red — ahead of pace: on a trajectory to exhaust the quota before it resets.
• Two styles: Tick (a thin vertical bar at the expected-pace position) and Solid (a filled band between actual usage and expected pace).
• Drawn on the bars of all three models — Claude, Codex, and Antigravity.

Screenshots

Green = headroom to ramp up; red = trajectory to exceed quota — in either style.

Style	Red — over pace	Green — headroom
Solid
Tick

Settings control

A right-click Settings → Show pace indicator submenu with Off (default) / Tick / Solid as a radio group; the parent entry shows a checkmark while a style is active. Off by default; persists to settings.json via #[serde(default)]. The indicator draws inside the existing bar segments, so it does not change the widget width.

Localization

All pace strings (Show pace indicator, Off (default), Tick, Solid) are translated across all 10 supported locales.

Independence & compatibility

Branches directly off v1.4.8 main (single commit) and contains only this feature — merge it alone, or alongside the detailed-remaining-time (#24) and ETD (#38) PRs in any order: every combination merges with 0 conflicts (verified via git merge-tree + a triple-merge that builds and passes tests).

Test plan

• cargo build + cargo test clean on v1.4.8
• Settings → Show pace indicator lists Off/Tick/Solid; selecting one draws on the 5h/7d bars across Claude/Codex/Antigravity
• Red when over pace, green when behind; Off clears it; widget width unchanged
• Selected style persists across restart

[dustingraham]

This feature is exactly what I was starting to look into. I think the "where am I in the 5 hours" and "where am I in the 7 days" is so useful.

[rohal12]

yes I built the exact same thing. this is what I need. am I on track or am I overshooting and run out of tokens on the last day?