feat(guides): rewrite in-product User Guides as Diátaxis how-tos
Replace 15 feature-dump guides with 43 problem-oriented how-tos grouped under 10 categories. Drop Maintenance Flows / AI Assistant / Flow Assist Sparkles — those surfaces no longer exist post-FlowPilot pivot. Rename Step Library → Solutions Library throughout. Correct every "click X in the sidebar" reference to match live labels (Home, History, Tickets, Flows, Scripts, Data, Acct). Schema: add `category: CategoryId` and optional `relatedSlugs` to Guide; new Category type and `categories` const drive hub ordering. GuidesHubPage renders category sections (auto-hides empty); GuideDetailPage renders a related-guides footer when set; GuideCard drops the misleading "N sections" subtitle. Fix step.tip markdown rendering — `**bold**` rendered literally because tip used plain text instead of the same regex replacement used on instruction. 14 net-new how-tos for FlowPilot-era surfaces with no prior coverage: tasklane keyboard flow, view-what-we-know, ask-AI mid-session, pause-and-leave, resolve, record-fix-outcome, escalate (Escalation Mode), post-docs-to-ticket, send-client-update, build-script-from-scratch, open-suggested-flow, pin-a-flow, invite-teammate. Browser-verified against engineer + owner test users (sidebar labels, account sub-pages, pilot-screen header buttons, Tasks panel, integration form). tsc clean. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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