Add webhook migration wizard support

[premtsd-code]

Summary

Stacks on #3044. Adds webhook as its own top-level group in the migration wizard, parallel to platforms / api-keys / project-variables.

The description text warns operators that signing secrets don't survive the migration (SDK constraint — see utopia-php/migration#185).

Cross-repo

• Add webhook migration support utopia-php/migration#185
• Add webhook migration support appwrite#12314
• appwrite-labs/cloud#4035

[greptile-apps]

Greptile Summary

This PR adds webhook support to the migration wizard as a child option under the existing "Settings" group (alongside project variables), following the same parent/child pattern already used for integrations (platforms + api-keys). The signing-secret caveat is correctly surfaced via descriptionMap.settings.webhooks and renders as the description on the child checkbox inside the settings Accordion.

• migration.ts adds 'webhook' to the resource union, MigrationResources, ResourcesFriendly, and providerResources.appwrite, and keeps both migrationFormToResources and resourcesToMigrationForm symmetric.
• resource-form.svelte extends shouldRenderGroup('settings') to show the group when either ProjectVariable or Webhook is available.
• importReport.svelte adds the webhook label and signing-secret description to the settings labelMap/descriptionMap; the description reaches users as the description prop on the child Selector.Checkbox inside the Accordion.

Confidence Score: 5/5

Safe to merge; changes are additive and follow established patterns throughout the migration wizard.

All three files make narrowly scoped, additive changes that mirror the existing api-key/platform nesting pattern. The form↔resource conversion helpers are symmetric, the provider guard correctly limits webhooks to the appwrite provider, and the signing-secret warning reaches users as the child-checkbox description inside the settings Accordion.

No files require special attention.

Important Files Changed

Filename	Overview
src/lib/stores/migration.ts	Adds 'webhook' to the MigrationResource union, MigrationResources constant, ResourcesFriendly map, providerResources.appwrite, and both form↔resource conversion helpers. Logic is symmetric and consistent with the existing api-key/platform pattern.
src/routes/(console)/(migration-wizard)/resource-form.svelte	Extends shouldRenderGroup('settings') to include the Webhook resource check, correctly following the same OR pattern used for integrations (platform
src/routes/(console)/project-[region]-[project]/settings/migrations/(import)/importReport.svelte	Adds webhooks label and description to the settings group; the signing-secret caveat in descriptionMap.settings.webhooks is correctly surfaced as the child-checkbox description prop inside the Accordion branch.

_{Reviews (2): Last reviewed commit: "Add webhook migration wizard support" | Re-trigger Greptile}