Fix PCP auth redirect and restore dynamic menu/header loading

[unclehowell]

Motivation

• The PCP dashboard was redirecting to /login.html outside the app path which caused a broken post-load navigation and disappearance of header styles and menu content.
• The left navigation failed to populate because the dynamic menu/header loaders were fragile when served from different route contexts and when responses lacked JSON content-type.

Description

• Update static/pcp/index.html to redirect unauthenticated users to /static/pcp/login.html and keep auth navigation within the PCP app path.
• Update static/pcp/login.html to redirect authenticated users back to /static/pcp/index.html for both the already-authenticated and successful-login flows.
• Replace static/pcp/js/menu-loader.js with a robust loader that tries relative and absolute PCP paths, parses response text (not relying on content-type), preserves icons, marks nested items with data-lte-toggle="treeview", and dispatches a menuLoaded event after rendering.
• Replace static/pcp/js/header-loader.js with the same resilient JSON-fallback approach and stable header rendering.

Testing

• Static syntax check for the updated JS loaders passed (node -e evaluated both loader files successfully).
• Local HTTP server served the site for validation (python3 -m http.server --directory ...) and behaved as expected.
• Playwright browser validation confirmed that unauthenticated visits to /static/pcp/index.html redirect to /static/pcp/login.html and authenticated visits stay on the dashboard and populate the sidebar (the automated script detected 33 menu items); screenshots were captured showing the restored dashboard state.

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