quick speed-up fixes

Fixed compatibility with Overleaf’s current editor tabs. OverCite now reliably updates the active source and bibliography files without switching to or modifying stale unrelated files.

Browser hotfix for v0.3.4:
- Fixed a citation-count merge error that could show preferredCitationCount is not defined.
- Failed lookups now show a retryable popup state instead of leaving stale UI.
- Background-worker timeout messages now tell users to refresh the Overleaf page and try again.

OverCite 0.3.3 improves rapid citation insertion and search result clarity.

• Adds an optional “Return to source file after insert” setting for Overleaf.
• Dismisses the popup promptly after successful insertion when return-to-source is enabled.
• Adds citation-count badges where provider metadata is available.
• Improves simple-search ranking for title evidence, duplicate records, hyphenated author keys, and paper-vs-catalog distractors.
• Updates the Physics preset to prefer ADS/SciX when configured, then Crossref and arXiv if needed.

OverCite 0.3.0 expands beyond ADS/SciX while keeping the same simple workflow.

We now support usage for researchers in astrophysics, physics, math, computer science, biology/medicine, chemistry, and cross-disciplinary fields within them.

New:
- Subject-area presets for astrophysics, physics, math, computer science, biology/medicine, chemistry, and general DOI lookup
- New source support: arXiv, INSPIRE, Crossref, PubMed, and DataCite
- Optional custom source routing
- New citation key style: Author:Year
- Improved ranking for first authors, matching years, duplicate records, arXiv preprints, datasets, software, and non-paper records
- Direct lookup is now called Raw query

ADS/SciX remains the default fast path for astrophysics users.

Added a new citation-key mode: bibcode. OverCite can now rewrite inserted citations to ADS bibcodes such as 1975CMaPh..43..199H in both the browser and VS Code extensions.