refactor: rename Planarchy to CapaKraken (branding only)

User-facing rename across 20 files:
- Layout title/meta: "CapaKraken — Resource & Capacity Planning"
- Sidebar logo: "CapaKraken" with "RESOURCE & CAPACITY PLANNING"
- Sign-in page: "CapaKraken Control Center", "Sign in to CapaKraken"
- PWA manifest: name + short_name
- PDF reports: footer text
- Install prompt: "Install CapaKraken"
- AI assistant system prompt
- Webhooks test payload
- Email subject lines
- Tooltips, descriptions, empty states

NOT changed (technical identifiers):
- Package names (@planarchy/*)
- Import paths
- Database names
- Docker container names
- localStorage keys
- Domain URLs
- CLAUDE.md

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

packages/api/src/router/assistant-tools.ts

@@ -276,7 +276,7 @@ export const TOOL_DEFINITIONS: ToolDef[] = [
     type: "function",
     function: {
       name: "navigate_to_page",
-      description: "Navigate the user to a specific page in Planarchy, optionally with filters. Use this when the user wants to see data on a specific page (e.g. 'show me on the timeline', 'open the resources page').",
+      description: "Navigate the user to a specific page in CapaKraken, optionally with filters. Use this when the user wants to see data on a specific page (e.g. 'show me on the timeline', 'open the resources page').",
       parameters: {
         type: "object",
         properties: {