Make LightLogWeb shinylive-compatible and add export script

[JZauner]

Motivation

• Ensure the Shiny app can be bundled and run in Shinylive/browser environments by fixing resource path resolution and uploaded-file handling.
• Provide a reproducible export workflow to produce a standalone Shinylive bundle in live/ for deployment or testing.

Description

• Added resolve_www_path() in R/shinylive_paths.R to locate app/www either from an installed package or from local/export fallback locations and updated LightLogWeb() to use it via addResourcePath("extr", resolve_www_path()).
• Hardened rename_files() in R/rename_files.R to attempt file.rename() and fall back to file.copy() with cleanup and an informative error if preparation fails, to support virtual/browser filesystems used by Shinylive.
• Added scripts/export-shinylive.R, an executable R script that assembles package R/ sources and static assets into a temporary app folder, writes a minimal app.R entrypoint that sources the package code, and calls shinylive::export() to produce the live/ bundle.
• Added package testing support by adding testthat (>= 3.0.0) to Suggests and Config/testthat/edition: 3, and introduced tests in tests/testthat/test-shinylive-paths.R and tests/testthat/test-rename-files.R plus tests/testthat.R.

Testing

• Added automated tests: tests/testthat/test-shinylive-paths.R and tests/testthat/test-rename-files.R (no tests were executed in this environment).
• Attempted to run Rscript -e 'if(requireNamespace("shinylive", quietly=TRUE)) print(args(shinylive::export)) else cat("no shinylive\n")' which failed because Rscript is not available in this environment, so package tests were not run here.
• File-level verification: repository changes were committed successfully (git status --short clean after commit).

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[chatgpt-codex-connector]

Load package dependencies in generated app.R

The generated entrypoint only sources R/*.R and calls LightLogWeb(), but it never loads the packages that those sourced functions rely on via NAMESPACE imports (for example, LightLogWeb() in R/LightLogWeb-app.R calls addResourcePath(), page_navbar(), and shinyApp() without namespace qualifiers). In the clean Shinylive runtime this causes runtime errors like missing page_navbar/addResourcePath, so the exported bundle from this script can fail to start even though export itself succeeds.

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