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/VersionCompare.tsx

@@ -10,6 +10,7 @@ import {
   type ScopeItemDiff,
 } from "@planarchy/engine";
 import type { EstimateVersionView } from "~/components/estimates/EstimateWorkspace.types.js";
+import { InfoTooltip } from "~/components/ui/InfoTooltip.js";
 import { formatMoney } from "~/lib/format.js";
 
 function formatDelta(value: number, formatter: (v: number) => string) {
@@ -134,10 +135,10 @@ export function VersionCompare({ versions }: { versions: EstimateVersionView[] }
     <div className="space-y-6">
       {/* Version selectors */}
       <div className="rounded-3xl border border-gray-200 bg-white p-5 shadow-sm">
-        <h3 className="mb-4 text-base font-semibold text-gray-900">Compare versions</h3>
+        <h3 className="mb-4 text-base font-semibold text-gray-900">Compare versions <InfoTooltip content="Select two version snapshots to see what changed in demand lines, scope, assumptions, and resource rates between them." /></h3>
         <div className="flex flex-wrap items-end gap-4">
           <label className="block">
-            <span className="mb-1 block text-xs font-medium text-gray-500 uppercase tracking-wider">Base (A)</span>
+            <span className="mb-1 block text-xs font-medium text-gray-500 uppercase tracking-wider">Base (A) <InfoTooltip content="The older or reference version to compare from." /></span>
             <select
               value={aId}
               onChange={(e) => setAId(e.target.value)}
@@ -154,7 +155,7 @@ export function VersionCompare({ versions }: { versions: EstimateVersionView[] }
           <span className="pb-2 text-sm text-gray-400">vs</span>
 
           <label className="block">
-            <span className="mb-1 block text-xs font-medium text-gray-500 uppercase tracking-wider">Compare (B)</span>
+            <span className="mb-1 block text-xs font-medium text-gray-500 uppercase tracking-wider">Compare (B) <InfoTooltip content="The newer or target version to compare against." /></span>
             <select
               value={bId}
               onChange={(e) => setBId(e.target.value)}