fix(Billing): Contact Sales opens the sales form instead of support chat

[Holmus]

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• I have filled in the "Changes" section below.
• I have filled in the "How did you test this code" section below.

Changes

The Enterprise "Contact Sales" button on the billing page opened the Pylon support chat. That sends sales enquiries to the support queue, does nothing for free-plan organisations (the people most likely to click it), and will stop working once Pylon chat is switched off.

• Contact Sales opens the website's "Contact Enterprise Sales" HubSpot form in a side panel, so users stay in the dashboard and submissions go to the same place as the website form.
• The user's name and email are prefilled from their account.
• If the form can't load (for example, an ad blocker stops HubSpot), the panel links to the form on flagsmith.com instead.
• Local development only: HubSpot's form embed resizes its iframe from a ResizeObserver, which the dev server overlay reported as a runtime error when the panel closed. The local dev config ignores that one benign error and otherwise keeps the overlay defaults. Browsers don't show it to users, and Sentry ignores it by default.

Review effort: 2/5

How did you test this code?

• Rendered the real form at side-panel width on a dark background with the prefill applied. HubSpot's validation flagged only the empty message field, so the prefilled values register. Nothing was submitted.
• Locally: CI=true lint on changed lines, the full unit test suite and the production build pass. Confirmed the dev overlay still shows build errors and no longer shows the resize error.
• Manual check against staging (ENV=staging npm run dev): Billing → Enterprise → Contact Sales opens the prefilled form, a test submission arrives in HubSpot, and with an ad blocker on the fallback link shows.

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated
flagsmith-frontend-preview	Ready	Preview	Oct 9, 2026 3:16pm UTC
flagsmith-frontend-staging	Ready	Preview	Oct 9, 2026 3:16pm UTC

1 Skipped Deployment

Project	Deployment	Actions	Updated
docs	Ignored		Oct 9, 2026 3:16pm UTC

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