feat(billing): include chat and monthly investigations, simplify pricing

[izadoesdev]

Pricing cards currently mix credit grants with zero investigations, duplicate allowances, and an unconfigured $2 introductory price. Disabled billing switches also leave empty expanded space. This change defines Business at 100 completed investigations per month and Scale at 500, with $1 per extra investigation, and includes ordinary Databunny chat on new plans through Autumn.

Dashboard and public pricing use three primary cards with detailed limits in a collapsed comparison. Native prices and allowances replace copied provider prose and unsupported promotions; zero investigation markers, popularity/carbon claims, duplicate grants, and redundant checkout wording are removed. Event usage rates remain accessible. The public calculator, pricing API v3, structured data, Markdown, and investigation copy agree with the configured offer. Free, Scale, and Enterprise remain accessible as secondary public options.

Billing shows actual attached allowances, resets, purchased balances, additional usage, and custom prices, including complimentary subscriptions. Included-chat accounts hide credit purchase and auto-top-up controls; existing legacy balances and paid add-ons retain their terms and management controls. Closed settings unmount their fields. Failed or mismatched Autumn customer reads cannot overwrite saved billing caps. Expanded subscription reads bypass the plain-customer cache, and native chat entitlement is checked before model execution.

The cleanup deletes duplicate pricing components, a redundant test fixture wrapper, renderer context, and tier-difference helpers. Temporary research/sync/schema-apply scripts were outside the repository and have been removed separately; this PR adds no .mjs files.

Validation: final integrated repository lint, all 33 configured type/build tasks, and all 27 repository test tasks pass. Dashboard pricing passes 17 native renderer cases / 79 assertions, four desktop/mobile browser scenarios, and six billing-control browser regressions. Click/tap/keyboard rate disclosures, collapsed comparison, save/reload, and plan-change error feedback are verified. Focused native billing-control coverage passes 10 tests / 63 assertions. Public pricing passes 30 tests / 234 assertions and desktop/mobile browser checks, including collapsed comparison, accessible usage rates, no page overflow/errors, and a $324 estimate for 125 Business investigations. Synthetic provider fixtures cover native prices, allowance periods, legacy terms, and save failures; no production customer is used as a billing test.

Rollout is paused at the user's request. This update is for review and push; no live plan update, customer activation, or production database mutation is included. The native chat feature was created earlier, but live plans still have their old terms. The separate production promotion PR #789 remains a paused draft. The earlier investigation ledger is already on staging from #786; its necessity is under review, and its discarded apply scripts are not a release requirement established by this cleanup. Live Autumn invoice/reset behavior remains unverified in sandbox.

Scope is investigation pricing, included chat billing, and their presentation. No dependency on an unmerged PR; default model routing is owned by #784. AI-assisted implementation and review under the maintainer workflow.

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Project	Deployment	Actions	Updated
dashboard	Ready	Preview	Sep 13, 2026 5:12pm UTC
databuddy-status	Ready	Preview	Sep 13, 2026 5:12pm UTC
documentation	Ready	Preview	Sep 13, 2026 5:12pm UTC

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Name	Status	Preview	Inspect	Updated (UTC)
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[izadoesdev]

@greptileai Please review final head f355c18. The loading placeholder finding is fixed and resolved; the final follow-up also removes an unconfigured introductory price and shortens investigation terms.

[izadoesdev]

@greptileai Please review final head 875f665. The additional change preserves cancellation and native prices for existing active, past-due, and scheduled paid add-ons while hiding new credit offers. The earlier layout and native-price findings remain fixed. All local required checks and the added synthetic browser scenarios pass.