* feat(cost): offer month-to-date and all-history cost ranges

CLI 0.67.0 computes calendar reporting periods with `cost --period
month-to-date|all`. Usage & Spend now offers Month to date and All
history beside 7, 30, and 90 days. A new `costHistoryPeriod` setting
holds the period; choosing a day range in the popup, or a history
window in the settings, returns to days.

Snapshots carry the CLI's `reportingPeriod` and match the selected range
by it, since a month's day count grows through the month. Both periods
are titled in the user's language. `--period all` reports the days since
year 1, so its chart window runs from the oldest recorded day to the
scan day, within 365 days; the CLI's totals still cover all history.
Privacy mode and the shared usage image keep the period.

An older CLI rejects the option with an `args` error record; the widget
then names the release the periods need, and day ranges keep working.

Documentation impact: CHANGELOG Unreleased, README feature summary,
usage guide and cost-history rules; the completed "Cost reporting
periods" TODO entry is removed.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* fix(cost): keep all-history aggregates beyond the charted year

Codex review on #389: an All history response longer than 365 days
passed the chart bound to the model and daily-average aggregation, so
model totals, the shared model ranking, and the average covered only the
newest year while labeled All history. Those aggregates now use the
recorded span within the existing 2,048-record scan budget; the chart,
heatmap, and history rows keep at most 365 days. The whole-range average
travels with the snapshot and through privacy mode.

The review also noted that sizing the All history window walked every
`daily` record. It now reads only the newest scan budget, like the daily
normalization.

Documentation impact: usage guide and cost-history rules state the
aggregate coverage.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

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Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>