Improve LaTeX workspace, SyncTeX jumps, and edit safety

[SmallSpider0]

Problem

DeepScientist's LaTeX editor did not yet feel like a coherent, safe paper-writing workspace for real multi-file manuscripts:

• Opening chapter files, BibTeX files, or style files could fragment the workflow across separate editor instances instead of staying inside one LaTeX project workspace.
• The PDF preview could not reliably jump back to the corresponding LaTeX source location.
• Raw SyncTeX line/column data was not enough for word-level selection, especially across files, repeated words, front matter, and ambiguous rendered tokens such as citation numbers.
• The editor chrome used more vertical space than necessary for long-form paper editing.
• If an external process changed the active LaTeX source file, such as an AI edit or terminal command, the editor could keep stale content in memory; saving from that stale buffer could silently overwrite the external change.

Solving this is meaningful because research papers are usually multi-file projects, and DeepScientist agents may edit the same LaTeX files that the user has open. A local-first research OS needs Overleaf-like ergonomics plus local filesystem safety: one project workspace, quick source switching, compile/preview in context, accurate PDF-to-source navigation, and protection against losing edits made outside the browser editor.

Solution

• Add a recursive LaTeX project manifest API that lists editable/source/resource files, identifies the main file, and records \\input, \\include, bibliography, and style/resource relationships.
• Compile LaTeX with SyncTeX enabled and persist SyncTeX metadata in build records.
• Add a reverse SyncTeX API for PDF-to-source lookup.
• Improve backend source selection by combining SyncTeX samples, PDF word boxes, PDF context words, LaTeX tokenization, macro aliases, front-matter remapping, and confidence-based fallbacks.
• Avoid false source selections for low-information ambiguous PDF tokens; fall back to line-start cursor placement when evidence is weak.
• Update the LaTeX editor so files inside the same LaTeX project switch inside one editor, rather than creating duplicate top-level editors or internal source tabs.
• Add a shared LaTeX open queue and stable LaTeX workspace tab identity.
• Support first-double-click cross-file PDF jumps by waiting until Monaco is bound to the target source file before applying selection/reveal.
• Use Monaco selection directly for PDF-to-source jumps and remove the previous marker-style behavior.
• Add LaTeX/BibTeX Monaco language registration and snippets/highlighting support.
• Compress the LaTeX editor top bar into a denser single-row layout.
• Track file revisions when opening/saving quest LaTeX sources so backend optimistic conflict checks can reject stale writes instead of re-reading the latest revision right before save.
• Refresh the active LaTeX editor automatically when the file changes externally and the local buffer is clean.
• Pause autosave and show explicit reload/overwrite actions when the file changes externally while the local buffer is dirty.
• Listen for AI file-diff events, window focus, visibility changes, and periodic polling to catch external source updates.
• Update English and Chinese workflow docs for the new LaTeX workspace and external-change behavior.

Test

python -m compileall src/deepscientist
pytest tests/test_latex_runtime.py tests/test_api_contract_surface.py tests/test_memory_and_artifact.py::test_save_document_rejects_stale_revision_after_external_change -q
npm --prefix src/ui run build
git diff --check

Result:

36 passed
UI build passed