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/VersionsTab.tsx

@@ -8,6 +8,7 @@ import type {
   EstimateVersionView,
   EstimateWorkspaceView,
 } from "~/components/estimates/EstimateWorkspace.types.js";
+import { InfoTooltip } from "~/components/ui/InfoTooltip.js";
 import { formatDateLong, formatMoney } from "~/lib/format.js";
 
 const VERSION_STYLES: Record<EstimateVersionStatus, string> = {
@@ -74,6 +75,10 @@ export function VersionsTab({
 
   return (
     <div className="space-y-3">
+      <div className="flex items-center gap-2 text-sm text-gray-500">
+        <span>Versions are immutable snapshots of the estimate for comparison and audit.</span>
+        <InfoTooltip content="Each version captures a full copy of scope, assumptions, demand lines, and metrics. WORKING versions can be edited; SUBMITTED and APPROVED versions are locked." />
+      </div>
       {versions.map((version) => (
         <div key={version.id} className="rounded-3xl border border-gray-200 bg-white p-5 shadow-sm">
           <div className="flex flex-wrap items-start justify-between gap-4">