[codex] Fix workspace preview layout

[ASIWU]

Summary

Fixes the workspace preview panel layout so embedded preview shells can render without duplicate chrome, keep scrollable content bounded, and lazy-load the molecular viewer without pulling the full renderer into the default outlet path.

Scope

This PR only touches renderer workspace-preview files and the local 3dmol type shim needed by the preview fix. It intentionally excludes the research memory/project-extension runtime changes.

Validation

• npx vitest run src/renderer/src/workspace-preview src/renderer/src/components/WorkspaceFilePreviewPanelBridge.test.tsx
• npm run typecheck
• npm run build

Split Audit

• No files overlap with codex/research-memory.
• Ignored build outputs were not committed or pushed.

[Copilot]

Pull request overview

Improves the renderer-side workspace preview layout to better support embedded previews by removing duplicate chrome, tightening overflow/scroll behavior, and deferring molecular viewer loading so the heavier renderer code path isn’t pulled into the default outlet.

Changes:

• Added showHeader / showInspector controls to preview chrome and shell so embedded previews can suppress duplicate UI.
• Updated preview viewer layouts to use bounded flex/overflow patterns (and adjusted tests accordingly).
• Lazy-loaded the molecular viewer route in the plugin outlet and added a local 3dmol type shim to support the molecular preview path.

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/renderer/src/workspace-preview/WorkspacePreviewPluginOutlet.tsx	Adds a lazy-load route for the molecular viewer and a loader/error UI for the outlet.
src/renderer/src/workspace-preview/WorkspacePreviewPanelShell.tsx	Plumbs showHeader/showInspector into the chrome and constrains shell body overflow.
src/renderer/src/workspace-preview/WorkspacePreviewChrome.tsx	Makes header/inspector optional and adjusts container/body layout for bounded scrolling.
src/renderer/src/workspace-preview/TextWorkspaceViewer.tsx	Adds optional header rendering and fixes flex/overflow so the editor stays bounded.
src/renderer/src/workspace-preview/TextWorkspaceViewer.test.ts	Adds coverage for embedded “no header” rendering and new layout classes.
src/renderer/src/workspace-preview/plugin-outlet.test.tsx	Updates molecular outlet marker expectations to the new loader state element.
src/renderer/src/workspace-preview/MarkdownWorkspaceViewer.tsx	Prevents nested scroll issues, embeds text viewer without header, and bounds grid overflow.
src/renderer/src/workspace-preview/MarkdownWorkspaceViewer.test.ts	Updates assertions for new bounded overflow behavior and embedded text header removal.
src/renderer/src/workspace-preview/chrome.test.ts	Updates assertions to reflect new overflow/layout class usage.
src/renderer/src/types/3dmol.d.ts	Introduces a minimal module declaration to satisfy TypeScript for import('3dmol').
src/renderer/src/components/WorkspaceFilePreviewPanelBridge.tsx	Embeds the preview shell with header/inspector disabled and tightens overflow/no-drag behavior.
src/renderer/src/components/WorkspaceFilePreviewPanelBridge.test.tsx	Updates mock/expectations for new shell props and class composition.
src/renderer/src/components/Workbench.tsx	Adjusts right panel container padding when the file preview panel is shown.

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[gaozhangyang]

Closing as superseded by the current gui workspace-preview architecture. We are carrying forward only the small, still-relevant pieces separately: bounded inner overflow for Markdown/Text viewers and a ds-no-drag boundary on the file-preview bridge. The legacy header/inspector controls, 3Dmol shim, Workbench inset, wheel interception, and old molecular lazy-loader implementation are not being merged.