feat: project cover art with AI generation, branding rename, RBAC fix, computation graph

- Add DALL-E cover art generation for projects (Azure OpenAI + standard OpenAI)
- CoverArtSection component with generate/upload/remove/focus-point controls
- Client-side image compression (10MB input → WebP/JPEG, max 1920px)
- DALL-E settings in admin panel (deployment, endpoint, API key)
- MCP assistant tools for cover art (generate_project_cover, remove_project_cover)
- Rename "Planarchy" → "plANARCHY" across all UI-facing text (13 files)
- Fix hardcoded canEdit={true} on project detail page — now checks user role
- Computation graph visualization (2D/3D) for calculation rules
- OG image and OpenGraph metadata

Co-Authored-By: claude-flow <ruv@ruv.net>

apps/web/src/components/estimates/tabs/AssumptionsTab.tsx

@@ -1,5 +1,6 @@
 "use client";
 
+import { InfoTooltip } from "~/components/ui/InfoTooltip.js";
 import type {
   EstimateVersionView,
   EstimateWorkspaceView,
@@ -25,22 +26,22 @@ export function AssumptionsTab({ estimate }: { estimate: EstimateWorkspaceView }
   return (
     <div className="rounded-3xl border border-gray-200 bg-white shadow-sm">
       <div className="border-b border-gray-100 px-6 py-4">
-        <h2 className="text-sm font-semibold uppercase tracking-wide text-gray-600">Commercial and delivery assumptions</h2>
+        <h2 className="text-sm font-semibold uppercase tracking-wide text-gray-600">Commercial and delivery assumptions <InfoTooltip content="Preconditions that affect the estimate validity. If any assumption changes, the estimate may need revision." /></h2>
       </div>
       <div className="divide-y divide-gray-100">
         {assumptions.map((assumption) => (
           <div key={assumption.id} className="grid gap-3 px-6 py-4 md:grid-cols-[160px,1fr,1fr]">
             <div>
-              <p className="text-xs uppercase tracking-wide text-gray-400">Category</p>
+              <p className="text-xs uppercase tracking-wide text-gray-400">Category <InfoTooltip content="Groups assumptions by topic, e.g. 'commercial', 'delivery', 'technical'." /></p>
               <p className="mt-1 text-sm font-medium text-gray-900">{assumption.category}</p>
             </div>
             <div>
-              <p className="text-xs uppercase tracking-wide text-gray-400">Label</p>
+              <p className="text-xs uppercase tracking-wide text-gray-400">Label <InfoTooltip content="Human-readable description of the assumption. The key below is the machine-readable identifier." /></p>
               <p className="mt-1 text-sm text-gray-800">{assumption.label}</p>
               <p className="mt-1 text-xs text-gray-400">{assumption.key}</p>
             </div>
             <div>
-              <p className="text-xs uppercase tracking-wide text-gray-400">Value</p>
+              <p className="text-xs uppercase tracking-wide text-gray-400">Value <InfoTooltip content="The concrete value or condition for this assumption." /></p>
               <p className="mt-1 text-sm text-gray-800">{String(assumption.value)}</p>
             </div>
           </div>