fix(clients): display CLI values verbatim, align period windows, true Lifetime tab

[iamtoruk]

Client half of the cross-surface accuracy work: the desktop app, web dash, and macOS menubar must display CLI-computed values verbatim. Full audit of every client-side computation, then fixes for the drifted sites.

The user-facing correctness fix

The desktop app tab labeled "All time" actually renders the CLI's all period, which is a 6-month window. A user reading "All time" was seeing a 6-month total. The tab now reads "Last 6 months", and true all-time is the new "Life" tab (the lifetime period from #753, which no client had exposed).

Parity fixes

• lifetime wired end-to-end: renderer period.ts window (1970-01-01, matching cli-date), Period types, TopBar tab, dash period list, mac Period enum + panel control (kept out of menubar metric cases). Swift cliArg mapping tested.
• Parity test table: renderer periodWindowStart asserted equal to cli-date getDateRange for all six periods, so the mirrors can never silently diverge again.
• Verified-clean sites (no change needed): app currency applied exactly once at the display leaf on raw-USD sums; Plans consumes projectedMonthEnd/percentUsed verbatim; dash forwards period keys (CLI computes windows); mac QuotaPace is legitimate client math (payload carries only percent/resetsAt).

Flagged, not fixed (documented in the audit)

1. App "Models this period" table re-aggregates history.daily for token columns current.topModels doesn't carry (~0.1-0.2% cost undercount from per-day top-N truncation; 365-day cap vs lifetime hero). Proper fix is adding tokens to current.topModels in menubar-json — follow-up after the sibling CLI-totals PR lands, to avoid overlap.
2. App vs menubar spend-projection formulas differ (median-based vs linear); neither is CLI-emitted, so converging is a product decision, not a drift fix.
3. Dash prints $ with no FX conversion — pre-existing endpoint limitation, not client drift.

Tests: app 411 passed (14 period tests incl. the 6-row parity table), Swift 83 passed (2 new), app+dash typecheck/build clean.