release: dev → main (implement SPA with subscriber, campaign, list, template and bounce management)

[TatevikGr]

Summary by CodeRabbit

• New Features

  • Full SPA dashboard with KPI tiles, charts, recent campaigns, and quick actions.
  • Complete campaigns and lists UIs with create/edit flows, detailed views, and modals.
  • Subscriber management: searchable directory, filters, row-level modal, bulk actions, CSV import/export.
  • Responsive sidebar, header search, and improved admin layout.

• Bug Fixes

  • Switched to the updated REST API integration and cleaned up legacy client behavior.

• Style

  • Tailwind-based redesign, revamped login page, updated UI components.

• Chores

  • Frontend build/test/tooling added and session-based auth enabled.

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