Local AI & OAuth Improvements

• Run AI Locally with Ollama — Install and manage Ollama directly from hosea. No API keys needed. Smart model recommendations based on your system RAM.
• One-Click OAuth — Authorize vendor connectors (GitHub, QuickBooks, Ramp) with a single click. Tokens persist across restarts with AES-256-GCM encryption.
• OAuth Scope Selector — Fine-grained scope control with checkbox-based selector showing human-readable descriptions.
• Routines — Create and run multi-step automated workflows. Build routines with the visual Routine Builder, then execute them on any agent tab.
• Ollama Model Download — Manage and download Ollama directly from the new Settings > Local AI tab. Auto-start on launch, external installation detection, and per-platform binary support.
• What's New Popup — See release highlights after every update, with the ability to browse previous versions.