IAV-1279: external docs, agent selection fix & coming-soon per agent

Summary

• External documentation: platformGuideSection (guide card with steps + docs URL) added to all 16+ config view cases in AddAccountModal. Three stale CREDENTIAL_TYPE_TO_GUIDE_KEY mappings fixed. hideGuide / embeddedInModal props extended to 13 config view components to prevent duplicate guide sections.

• Agent selection fix: Bypassed wizard completion checks for testing — all agents are now selectable in Step 1. Fixed a useEffect that was resetting selectedAgent to null immediately after selection due to wizard status check firing before/after mount.

• Per-agent coming soon: New comingSoonAgents?: string[] field on Integration. Agents in that list show a greyed "Bientôt disponible" badge in AddAccountModal Step 1 and cannot be selected, without affecting other agents in the same integration. Applied to: RH & Agent Téléphonique on Teams, Slack, LinkedIn, Google Drive, SharePoint, OneDrive, Amazon S3, Google Calendar, Outlook/Outlook Calendar.

• Integration data cleanup: Outlook and Outlook Calendar merged into a single entry. Instagram Message added with correct credential type. comingSoonAgents replaces integration-level comingSoon where appropriate.

• Warning UI: "Informations à copier pour la configuration" box styled red (background, border, icon, title) with a conservation warning message — applied to 5 files (wizard step-9, SAV instagram/messenger and their dashboard variants).

• Sidebar: Wiki link now opens https://wiki.iavia.ai/ in a new tab.