IDE polish; image viewer, preview toolbar, editor themes

[rijulshrestha]

Four IDE improvements plus two clone-boot fixes.

• Image viewer: image files open in a viewer instead of dumping raw bytes into Monaco.
• Preview toolbar: reworked with hide and reload controls.
• Editor themes: a settings menu for switching TextMate themes.
• Cloned repos: Next.js clones run on webpack instead of Turbopack; the rolldown wasm binding now applies only from Vite 8.2.

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[rijulshrestha]

Refactors

1. Portal takes the PortalState controller instead of 18 forwarded props.
2. Agent boots gate on a CredentialSpec in cliConfigs instead of tool === 'codex' branches
3. Pane-drag lifecycle moves to utils/drag.ts, shared by IdeShell and the agents route.

No logic changes has been made. Visibly the terminal drags to 90% instead of stopping at 600px.