show contextual help on settings pages

[wojcik91]

Show contextual help (faqs, related docs, best practices) in the sidebar on relevant settings pages.
The content itself is served by the update service similar to tutorial videos.

Closes #2709

[Copilot]

Pull request overview

Adds update-service–driven “Contextual Help” (FAQ / related docs / best practices) as a sidebar helper on relevant Settings pages, similar to how video tutorials are served.

Changes:

• Introduce ContextualHelp data model, schema validation, version-based resolution, and a sidebar UI component.
• Add a React Query fetch + parse pipeline for contextual help mappings from the update service.
• Wire the sidebar into multiple Settings/Support/Enrollment pages via SettingsLayout.suggestion and i18n cleanup for Locations Migration wizard text.

Reviewed changes

Copilot reviewed 30 out of 30 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
web/src/shared/video-tutorials/resolver.ts	Switches video tutorials to reuse the shared version resolver utility.
web/src/shared/utils/resolveVersion.ts	Introduces a generic resolveVersion<T>() utility for newest-eligible version selection.
web/src/shared/query.ts	Adds contextualHelpQueryOptions to fetch/parse contextual help from update service.
web/src/shared/components/ContextualHelp/types.ts	Defines contextual help keys and mapping/content types.
web/src/shared/components/ContextualHelp/schema.ts	Adds Zod schema to validate update-service contextual help payload.
web/src/shared/components/ContextualHelp/resolver.ts	Resolves a page’s contextual help by app version + page key.
web/src/shared/components/ContextualHelp/index.ts	Exposes the sidebar component and key constants.
web/src/shared/components/ContextualHelp/hooks.ts	Adds useContextualHelp() hook to fetch + resolve per page.
web/src/shared/components/ContextualHelp/data.ts	Defines update-service path + re-exports the parser.
web/src/shared/components/ContextualHelp/ContextualHelpSidebar/ContextualHelpSidebar.tsx	Implements the sidebar UI for FAQs, related docs, and best practices.
web/src/shared/components/ContextualHelp/ContextualHelpSidebar/ContextualHelpSidebar.scss	Styles for the contextual help sidebar sections/cards.
web/src/pages/settings/SettingsSmtpPage/SettingsSmtpPage.tsx	Adds contextual help sidebar to SMTP settings.
web/src/pages/settings/SettingsLdapPage/SettingsLdapPage.tsx	Adds contextual help sidebar to LDAP settings.
web/src/pages/settings/SettingsInstancePage/SettingsInstancePage.tsx	Adds contextual help sidebar to Instance settings.
web/src/pages/settings/SettingsIndexPage/tabs/SettingsNotificationsTab.tsx	Adds contextual help sidebar to Notifications tab.
web/src/pages/settings/SettingsIndexPage/tabs/SettingsLicenseTab/SettingsLicenseTab.tsx	Adds contextual help sidebar to License tab.
web/src/pages/settings/SettingsIndexPage/tabs/SettingsGeneralTab.tsx	Adds contextual help sidebar to General tab.
web/src/pages/settings/SettingsIndexPage/tabs/SettingsExternalProvidersTab.tsx	Adds contextual help sidebar to Identity/External providers tab.
web/src/pages/settings/SettingsIndexPage/tabs/SettingsCertificatesTab/SettingsCertificatesTab.tsx	Adds contextual help sidebar to Certificates tab.
web/src/pages/settings/SettingsGatewayNotificationsPage/SettingsGatewayNotificationsPage.tsx	Adds contextual help sidebar to Gateway notifications settings.
web/src/pages/settings/SettingsExternalOpenIdPage/SettingsExternalOpenIdPage.tsx	Adds contextual help sidebar to OpenID settings.
web/src/pages/settings/SettingsClientPage/SettingsClientPage.tsx	Adds contextual help sidebar to Client settings.
web/src/pages/settings/SettingsCertificatesPage/SettingsCertificatesPage.tsx	Adds contextual help sidebar to Certificates page.
web/src/pages/settings/SettingsCaPage/SettingsCaPage.tsx	Adds contextual help sidebar to CA settings.
web/src/pages/settings/SettingsActivityLogStreamingPage/SettingsActivityStreamingTab.tsx	Adds contextual help sidebar to Activity settings.
web/src/pages/SupportPage/SupportPage.tsx	Adds contextual help sidebar to Support page.
web/src/pages/EnrollmentPage/tabs/GeneralTab.tsx	Adds contextual help sidebar to Enrollment general tab.
web/src/pages/LocationsMigrationWizardPage/LocationsMigrationWizardPage.tsx	Replaces hardcoded strings with i18n messages.
web/messages/en/migration_wizard.json	Adds i18n strings for Locations Migration wizard.
web/messages/en/components.json	Adds i18n strings for contextual help section titles.

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