fix: sync model selection dropdowns to cloud dashboard

[khaliqgant]

The model selection changes for Cursor and Codex (commit 4593c1c) were
only applied to packages/dashboard/ui/ (local dashboard) but not to
src/dashboard/ (cloud dashboard). This syncs those changes:

• Add CURSOR_MODEL_OPTIONS and CODEX_MODEL_OPTIONS arrays
• Add model dropdown selects for Cursor and Codex agents
• Change Claude model selection from button grid to dropdown
• Add supportsModelSelection flag to Codex and Cursor templates
• Add selectedCursorModel and selectedCodexModel state variables
• Update effectiveCommand to always include --model flag

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📊 174 files reviewed • 12 high risk • 8 need attention

🚨 High Risk:

• packages/dashboard/ui/react-components/App.tsx — UI components may include sensitive functionality or authenticated actions.
• packages/dashboard/src/server.ts — Server-side logic may have security implications.
• src/dashboard/app/connect-repos/page.tsx — Critical for user authentication flows, requires security and functionality checks due to complete removal.
• +5 more

⚠️ Needs Attention:

• package.json — Changes in dependencies can have security implications.
• packages/dashboard/ui/react-components/ChannelChat.tsx — Chat components often handle user inputs that require sanitization.
• +1 more concerns...

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