supabase / supabase / 28171670549

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feat(telemetry): classify funnel creation errors (#47293)

## Summary

The KPI-3 friction dashboard needs to know *why* users hit errors on the
signup, project-creation, and org-creation funnels, not just that they
did. The existing `dashboard_error_created` event already fires for
these paths (10% sampled, with `$pathname`), but carries no reason:
~98.5% of events have no `errorType` and no property carries an error
message. This adds PII-safe classification computed client-side from a
controlled vocabulary, so raw error text never leaves the browser.
Validation errors (previously invisible, since they are inline form
errors that never raise a toast) are now captured on invalid submit.

## Changes

- Extend `dashboard_error_created` with `origin`, `errorCategory`,
`errorReason`, `errorCode`, and a `form` source value
- Add a pure, unit-tested classifier (`funnel-errors.ts`) and a
10%-sampled tracking hook (`use-track-funnel-error.ts`); the classifier
maps errors to stable slugs and emits only slugs + HTTP status, never
raw message text
- Classify signup errors (API failures + validation) in `SignUpForm`
- Classify project-creation errors (API failures, OrioleDB guard,
validation) in the new-project wizard
- Classify org-creation errors (API failures, payment/card declines,
confirm-subscription, validation) in `NewOrgForm`

## Testing

13 unit tests cover every classifier branch (validation / api / network
/ payment, status-code handling, message-pattern matching, and
fallbacks).

To verify on the Vercel preview (events are 10% sampled; set the sample
rate to 1 locally to observe each fire):
- Signup with a weak but non-empty password: `origin=signup,
source=form, errorCategory=validation, errorReason=password_invalid`
- Signup with an already-registered email: `origin=signup, source=toast,
errorCategory=api, errorReason=email_already_registered`
- New project with an empty name: `origin=project_creation, source=form,
errorReason=project_name_invalid`... (continued)

1046 of 1450 branches covered (72.14%)

Branch coverage included in aggregate %.

32 of 37 new or added lines in 2 files covered. (86.49%)

1584 of 2152 relevant lines covered (73.61%)

245.6 hits per line