The AgentTabStrip was using allProvidersToday for cost display, which
meant tabs always showed today's per-provider costs regardless of
which period was selected. This caused the hero to show e.g. $209 for
30 Days but the Claude tab to show $59 (today's Claude cost).
Fix: cost(for:) now reads from store.payload (selected period) instead
of allProvidersToday. Tab VISIBILITY still uses todayPayload so tabs
don't disappear when switching periods.
Bug existed since the original menubar app commit (495a254, Apr 17).
Tabs were filtering on `value > 0` (today's spend), which hid the row
whenever only one provider had activity today. The CLI's providers map
already contains only providers detected on the system, so showing the
map as-is matches user intent: a tab for each installed tool,
regardless of today's spend. Tab strip only hides when nothing is
detected.
This also makes the Plan pill reachable again: it gates on
`selectedProvider == .claude`, which required clicking the Claude tab
to select.
The tab strip was visible for everyone regardless of which tools they
actually run, which produced a row of All + one provider for Claude-only
users and a row of All + zeros for users on exotic stacks. Hide the
whole row until a second provider has real spend, matching the behavior
the GNOME extension ships with.
Also expand ProviderFilter to include every provider the CLI supports
(OpenCode and Pi were missing) so their tabs appear when those tools
produce sessions. The CLI already emits pi and opencode in the payload's
providers map; the Mac app just wasn't offering a tab for them.
visibleFilters now filters on value > 0 instead of key presence, because
the CLI includes zero-cost entries for discovered-but-unused providers
and we don't want those rendering as blank tabs.
