When a document has no title, authors, date, or abstract, the article()
template unconditionally emitted a place(top, float: true, ...) with an
empty block. This counted as content, so a subsequent raw #set page(...)
in the document body triggered a page break in Typst, producing a blank
first page.

Guard the place() call so it is only emitted when there is actual title
block content.

Fixes #14217

When no pdf-standard is set in document YAML, fall back to the
QUARTO_PDF_STANDARD environment variable (comma-separated, e.g.
"ua-1" or "a-2b,ua-1"). This applies to LaTeX, Typst, and PDF
format resolution.

Includes a smoke test that verifies the env var produces the
expected \DocumentMetadata in LaTeX output.

…ass (#14274)

* fix: set UTF-8 code page in safeWindowsExec batch files (#14267)

safeWindowsExec writes temp .bat files as UTF-8 (Deno default), but
cmd.exe reads them using the OEM code page (e.g., CP850). Multi-byte
UTF-8 characters like é (0xC3 0xA9) get misinterpreted, breaking
paths with accented characters (e.g., C:\Users\Sébastien\).

Add `chcp 65001 >nul` to switch cmd.exe to UTF-8 before the command
line is parsed. Use CRLF line endings for correct .bat parsing.

* docs: add changelog entry for #14267 backport

…iew (#14288)

* Fix transient .quarto_ipynb files accumulating during preview (#14281)

Preview re-renders delete the fileInformationCache entry to pick up
file changes, but this loses track of the transient .quarto_ipynb path.
The collision-avoidance loop in jupyter.ts target() then sees the old
file on disk and creates numbered variants (_1, _2, etc.) that are
never cleaned up until preview exits.

Add invalidateForFile() to FileInformationCacheMap that cleans up any
transient notebook file from disk before removing the cache entry.
Replace the bare delete() call in renderForPreview() with this method.

Fixes #14281

Add type declarations for functions exported in init.lua that were
missing from the lua-types annotations. This feeds into the autogen
docs effort (quarto-dev/quarto-web#1649).

quarto.doc: add_resource, add_supporting, is_filter_active
quarto.utils: type, table.isarray, table.contains, table.sortedPairs,
  resolve_path_relative_to_document, as_inlines, as_blocks,
  is_empty_node, render, match, add_to_blocks

(cherry picked from commit 6ce64dc)

- EndBug/add-and-commit: v9.1.4 (node20) → v10.0.0 (node24)
- softprops/action-gh-release: v1-era (node20) → v2.6.1, remove deprecated env GITHUB_TOKEN
- julia-actions/setup-julia: @v2 (node20) → master SHA with node24 (no release yet)

Follow-up to #14199 which updated official actions/* and other third-party actions.

(cherry picked from commit 0ae540e)

[backport] Fix preview browse URL for single-file documents

Backport of #14300.

After #13804 made the project variable always non-null via
singleFileProjectContext(), single-file preview broke: the browse
URL included the output filename and GET / returned 404. Guard
both the URL path computation and handler selection with
!project.isSingleFile.

- Fix initialPath using relative path instead of empty string
- Fix handler selection using wrong default file for single files
- Add unit tests for previewInitialPath()
- Add manual preview test entries and plain.qmd fixture

Fixes #14298

Also sort #13878 into numerical order.

…tudio

Backport from #14307.

Gate `project` emission in `inspectDocumentConfig` on
`!(isSingleFile && isRStudio())` so RStudio's publishing wizard
doesn't crash on standalone .qmd files with Quarto >= 1.9.35.

Ref: rstudio/rstudio#17333

…ecate chromium installer (#14335)

Add arm64 Linux support for `quarto install chrome-headless-shell`
using Microsoft's Playwright CDN as the download source, since Chrome
for Testing has no arm64 Linux builds. Version metadata comes from
Playwright's browsers.json, and the arm64 binary name difference
(`headless_shell` vs `chrome-headless-shell`) is abstracted by a
platform-aware helper.

Add deprecation warnings guiding users from `chromium` to
`chrome-headless-shell`:

- `quarto install chromium` and `quarto update chromium` show
  deprecation before proceeding (including on WSL)
- `quarto check install` shows migration guidance when legacy
  Chromium is detected in the installed tools list

Add CI workflow (`test-install.yml`) covering arm64 Linux and macOS
tool installation, and chromium deprecation warnings across all
platforms.

Partial backport from #14334.

Fixes #1187