feat: post composition redesign + budget allocation + brand identity (Rawaj)

Post Workflow:
- PostDetail full page (/posts/:id) replaces slide panel approach
- Post = 1 Caption Copy + 1 Body Copy + 1 Design + 0-1 Video
- copy_type field on Translations (caption/body)
- Composition endpoint returns rich data (content preview, languages, thumbnails)
- Stage auto-advances on translation/artefact changes (both link and unlink)
- "Translations" renamed to "Copy" in navigation
- GET /api/posts/:id, /api/translations/:id, /api/artefacts/:id routes added
- PostProduction: "New Post" creates → navigates to full page
- CampaignDetail: click post → navigates to full page
- Inline link picker (no modals) with search + rich item display
- PostComposition sub-components for caption, copy, designs, video, formats, readiness

Budget Allocation:
- Single source of truth: BudgetEntries (Campaign.budget deprecated)
- Budget mutex for race conditions
- Validation at all levels (main → campaign → track, expenses)
- CEO approval workflow: BudgetRequests table, public approval page
- Finance page: request budget UI, budget requests section
- Settings: CEO email field
- All emails branded with "Rawaj —" prefix

Brand Identity:
- Name: Rawaj (رواج) — trending/virality
- Deep teal palette (#0d9488), forest-tinted dark mode
- DM Sans font, custom SVG logo
- Consistent across login, sidebar, emails, public pages

Approval Workflow:
- Single reviewer per artefact (not multi-select)
- Reviewer redirect on public review page
- Server blocks submit-review without reviewer
- Review URLs use APP_URL (not server URL)

UI/UX:
- Scroll clipping fix: Modal, TabbedModal, SlidePanel restructured
  to avoid overflow-y-auto clipping native select dropdowns
- section-card overflow-hidden → overflow-clip
- All page titles via Header.jsx (removed duplicate h1s)
- CampaignDetail redesigned: prominent budget card, compact team

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

client/src/i18n/en.json

@@ -78,6 +78,29 @@
   "posts.saveChanges": "Save Changes",
   "posts.postTitle": "Title",
   "posts.description": "Description",
+  "post.caption": "Caption",
+  "post.captionPlaceholder": "Write your social media caption...",
+  "post.copy": "Copy (In-Design Text)",
+  "post.designs": "Designs",
+  "post.video": "Video",
+  "post.formatChecklist": "Format Checklist",
+  "post.formatsNeeded": "Formats needed based on selected platforms",
+  "post.selectPlatforms": "Select platforms to see required formats",
+  "post.readiness": "Readiness",
+  "post.allPiecesReady": "All pieces ready — awaiting sign-off",
+  "post.waitingOn": "Waiting on",
+  "post.signOff": "Approve & Schedule",
+  "post.signOffConfirm": "Mark this post as approved and ready for scheduling?",
+  "common.confirm": "Confirm",
+  "post.linkExisting": "Link existing",
+  "post.createNew": "Create new",
+  "post.addDesign": "Add Design",
+  "post.addVideo": "Add Video",
+  "post.linkTranslation": "Link Translation",
+  "post.selectLanguage": "Language...",
+  "post.noCopyLinked": "No copy linked yet",
+  "post.noDesignsLinked": "No designs linked yet",
+  "post.noVideoLinked": "No video linked yet",
   "posts.brand": "Brand",
   "posts.platforms": "Platforms",
   "posts.status": "Status",
@@ -701,6 +724,11 @@
   "review.confirmReject": "Reject this artefact?",
   "review.feedbackRequired": "Please provide feedback for revision request",
   "review.contentLanguages": "Content Languages",
+  "review.redirectReview": "Not the right reviewer? Redirect to someone else",
+  "review.redirectDesc": "Select a team member to redirect this review to:",
+  "review.selectNewReviewer": "Select new reviewer...",
+  "review.redirect": "Redirect",
+  "review.redirected": "Review redirected successfully",
   "review.content": "Content",
   "review.designFiles": "Design Files",
   "review.videos": "Videos",
@@ -783,6 +811,8 @@
   "header.issues": "Issues",
   "header.settings": "Settings",
   "header.translations": "Translations",
+  "header.copy": "Copy",
+  "header.postDetails": "Post Details",
   "calendar.unscheduledPosts": "Unscheduled Posts",
   "calendar.statusLegend": "Status Legend",
   "header.users": "User Management",
@@ -882,6 +912,8 @@
   "artefacts.descriptionLabel": "Description",
   "artefacts.descriptionFieldPlaceholder": "Add a description...",
   "artefacts.approversLabel": "Approvers",
+  "artefacts.reviewer": "Reviewer",
+  "artefacts.selectReviewer": "Select a reviewer...",
   "artefacts.versions": "Versions",
   "artefacts.newVersion": "New Version",
   "artefacts.languages": "Languages",
@@ -1133,5 +1165,21 @@
   "translations.createPost": "New Post",
   "translations.newPostTitle": "Post title...",
   "translations.postCreated": "Post created!",
-  "translations.postCreateFailed": "Failed to create post"
+  "translations.postCreateFailed": "Failed to create post",
+
+  "nav.copy": "Copy",
+
+  "postDetail.captionCopy": "Caption Copy",
+  "postDetail.bodyCopy": "Body Copy",
+  "postDetail.design": "Design",
+  "postDetail.video": "Video",
+  "postDetail.readiness": "Readiness",
+  "postDetail.noAssets": "No assets linked yet",
+  "postDetail.allPiecesApproved": "All pieces approved",
+  "postDetail.waitingOn": "Waiting on",
+  "postDetail.notLinked": "Not linked",
+  "postDetail.linkExisting": "Link existing",
+  "postDetail.createNew": "Create new",
+  "postDetail.open": "Open",
+  "postDetail.unlink": "Unlink"
 }