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.

[GabrielaReyna]

Excellent work as usual, just added some minor comments. After addressing these it should be ready for merging.

One question, since you added "Cloned repos: Next.js clones run on webpack instead of Turbopack; the rolldown wasm binding now applies only from Vite 8.2.", these will start working only after merging the changes in the other PR, correct?

[rijulshrestha]

The first two commits overlap in both PRs. The Vite and Next changes are present in this PR, so they'll work even without merging the other PR. These two commits are meant to be compatible with browserpod v3.0.1, which is why they're present here.

The Vite modification is required for the latest Vite to work, but the Next fix isn't present in browserpod v3.0.1. There's no harm in adding it here already, though. The other changes in the other PR are based on the updated browserpod version, which isn't publicly available at the moment.