feat: add settings toggle to show detailed remaining time

[carlosresu]

Summary

Adds an opt-in Show detailed remaining time toggle under the right-click Settings menu. Rebased on v1.4.8 and extended to the Antigravity model. When enabled:

• The 5h session rows show minutes alongside hours (e.g. 4h 12m instead of 4h)
• The 7d weekly rows show hours alongside days (e.g. 3d 5h instead of 3d)
• Applies to all three models — Claude, Codex, and Antigravity
• The countdown repaints on the finer-unit boundary so the value never goes stale

Default is off, so existing installs see today's behavior. The preference persists in settings.json as show_detailed_remaining with #[serde(default)] for clean migration.

Dynamic column width

The usage-cell text column measures the actual rendered text and sizes to it, so the wider detailed strings (e.g. 100% · 23h 59m) fit without clipping and without reserving a fixed worst-case when the toggle is off. The widget grows only when content needs it.

Screenshots

Same usage/reset data, toggled via right-click → Settings → Show detailed remaining time.

Detailed time OFF	Detailed time ON

Sub-hour behavior unchanged

The toggle only adds a sub-unit when the top unit is h or d; minute/second displays render identically in both modes, and now is unchanged.

Localization

Show detailed remaining time is 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 pace-indicator (#25) 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
• Default off → unchanged (4h, 3d)
• On → detailed text renders (4h 23m, 2d 1h) across Claude/Codex/Antigravity; column tracks content with no clipping
• Settings checkmark reflects state; persists across restart