refactor: remove demo mode and simplify environment setup

[HarryRandall]

Summary

Remove the separate demo application path. Authentication and plan mutations now always use the normal Supabase flow, and sample catalogue/map data is confined to test and script fixtures. Simplify .env.example to essential settings and optional catalogue imports, documenting advanced overrides separately.

Replace demo rendering checks with authenticated local-database journeys, preserve the recently added layout, tab and client-navigation regressions, and add provider persistence/rollback tests. No database schema changes.

Verification

• pnpm check and pnpm verify
• 519 unit/component tests and eight anonymous access checks
• Fourteen authenticated browser journeys against an isolated local Supabase stack, including desktop/narrow layouts and light/dark course tabs
• Production builds for access checks and authenticated journeys
• Building asset generation, with unchanged output hash
• git diff --check

The branch is based on current main and preserves the newer course routes, planner structure and regression tests. Test-owned users and indoor-map records are cleaned up. No production data or schema was changed.

Deployment notes

COURSEMAP_DEMO_MODE is no longer used. Existing false values may be removed from local or deployment configuration. Optional map and local database overrides remain supported. No migrations or deployment-root changes are required.

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Project	Deployment	Actions	Updated
coursemap	Ready	Preview	Sep 7, 2026 7:58am UTC