feat(chatui): add tabbed workspace and PDF previews

[Soulter]

Workspace files currently use a single preview area and cannot display PDFs. This change adds a tabbed file workspace with an embedded PDF viewer, so users can browse files and read documents alongside their conversation.

Stacked on #10021. The base branch is codex/chatui-settings-and-reading; this PR contains only the workspace changes. Merge the parent PR first, then retarget this PR to master.

Modifications

• Rename the workspace entry to Files, place previews to the left of the file tree, and add a tree visibility toggle and larger preview dialog.

• Add closable file tabs with keyboard navigation. Single-clicking files reuses an italic temporary tab; interacting with its preview or double-clicking the file/tab keeps it open.

• Add a lazily loaded PDF.js canvas viewer with continuous scrolling, nearby-page rendering, bounded canvas buffers, and floating zoom controls. Preserve reading position when resizing or switching to the larger preview.

• Bundle the PDF worker and versioned character maps, fonts, WebAssembly, and color profiles locally for development and production.

• Cancel obsolete PDF downloads and handle oversized files, password-protected documents, and rendering failures while keeping downloads available. PDF previews are limited to 50 MB.

• Update Chinese, English, Japanese, and Russian labels. No backend routes or API schemas change.

• This is NOT a breaking change.

Screenshots or Test Results

• pnpm build passed, including Vue/TypeScript checking and production asset bundling.
• ruff format ., ruff check ., and git diff --check passed.
• Browser automation was not run; interaction testing is handled by the maintainer.

Checklist

• The features were requested and iterated on with the maintainer.
• Full interaction verification and screenshots are provided.
• The new frontend dependency, pdfjs-dist, is recorded in dashboard/package.json and dashboard/pnpm-lock.yaml.
• No malicious code is introduced.

Summary by Sourcery

Replace the single-file workspace preview with a tabbed Files experience that supports browsing code and reading PDFs within the chat interface.

New Features:

• Add a tabbed Files workspace for browsing and previewing multiple project files alongside chat.
• Add embedded PDF previews with continuous scrolling, lazy page rendering, zoom controls, and reading-position preservation.

Bug Fixes:

• Handle cancelled or obsolete PDF loads and report oversized, password-protected, and failed PDF previews without removing download access.

Enhancements:

• Improve workspace layout with resizable previews, tree visibility controls, larger preview dialogs, keyboard-navigable tabs, temporary file tabs, breadcrumbs, and code line numbers.

Build:

• Add pdfjs-dist and bundle its worker and required runtime assets locally for development and production.

Chores:

• Update workspace labels and PDF-related translations across English, Chinese, Japanese, and Russian locales.

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