Add additional organization billing information to the Svelte billing settings

[Copilot]

Organizations can save a billing name, address, VAT ID, and VAT number from Svelte billing settings. The form reuses existing organization data keys and endpoints; clearing a field removes its key. Invoice history retains its amounts, payment statuses, and actions.

Autosaves and individual key writes run sequentially to preserve edits made during saves and avoid overwriting sibling values in the backend's whole-document updates. Navigation waits for pending changes, and failed saves retain input for retry. Latest main is integrated without additional feature or API changes. The website workflow uses Deno 2.9.7 because its previous 2.5.7 pin cannot load the current Lume dependency.

Validation: 821 frontend tests passed; formatting, lint, Svelte checks (zero errors/warnings), production build, Storybook build, and website Deno verification passed. Desktop/mobile billing scenarios passed twice each against a local production build with mocked API responses.

Remaining gates: full-stack local persistence verification is pending; fresh hosted checks must finish, and the existing Copilot CLA check remains unresolved. This PR remains draft.

Verification details

• Browser scenarios cover all four fields, reload, clearing/deleting a key, preserving unrelated data, save failure/retry, and navigation before and during saves at 1440px and 390px.
• An initial development-mode mobile run was interrupted by a Storybook-triggered Vite reload. Three mobile reruns and all four stable production-build runs passed.
• Invoice tests cover amounts/status presentation, opening invoices, and empty/loading/error states.
• No review threads or submitted reviews were outstanding when inspected.
• Mocked browser tests establish frontend behavior, not backend persistence. Existing API routes, authorization, response types, and stored keys are unchanged.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
2 out of 3 committers have signed the CLA.

✅ ejsmith
✅ niemyjski
❌ Copilot
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[niemyjski]

Follow-up reviewer-feedback and thermo-nuclear audit completed against live head e93c6879c3d0309d7024b4d8d510e42eaa654eb3 and origin/main dc940dd15c8d222d9764080622fdf4583d4546b8.

Feedback inventory and classification:

• GraphQL review threads: 0 total / 0 unresolved.
• Inline review comments: 0.
• Submitted reviews: 0.
• Top-level comments: the coverage report is informational and green; the CLA Assistant notice is an external gate because the Copilot committer cannot sign the CLA. There is no human, Codex, or Copilot code-review finding outstanding at the current live head.

Thermo-nuclear findings:

• No remaining structural blocker or justified code change was found in the complete branch-vs-main diff.
• The invoice table is isolated in an 89-line presentational component with populated/empty/loading/error Storybook states; the billing route is 301 lines and no changed file crosses 1,000 lines.
• Serialized autosaves prevent older responses from overwriting newer input.
• Per-key writes intentionally remain sequential: the backend handlers load and save the whole organization document per request, so parallel sibling-key writes can lose updates. This is correctness orchestration, not incidental serialization.
• Missing/malformed legacy data normalizes safely, cleared values delete their stable keys, generic API access remains organization-scoped, and no API contract changed.
• The PR description’s stale test filenames and unsupported backend-test claim were corrected.

Verification:

• Focused Vitest: 3 files / 11 tests passed.
• npm run check: 0 errors / 0 warnings.
• npm run build: passed.
• npm run build-storybook: passed.
• git diff --check origin/main...HEAD: passed.
• Build workflow 30205531546: API, client, E2E, Docker, and version passed.
• Website workflow 30205531465: passed.

No commit was needed for this follow-up audit. The PR is code-ready and GitHub reports it mergeable; the remaining gates are the existing draft state and pending Copilot CLA.

[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
Exceptionless.Insulation	37%	35%	286	❌
Exceptionless.Web	85%	70%	8108	✔
Exceptionless.Core	76%	68%	10538	✔
Exceptionless.AppHost	38%	41%	147	❌
Summary	79% (26389 / 33396)	68% (12275 / 18049)	19079	✔