Fix R oldrel-1 CI failure: replace ggpubr with patchwork + graceful internet error handling

[Copilot]

PR #506 was failing on ubuntu-latest (oldrel-1) because ggpubr → ggrepel >= 0.9.2 → R >= 4.5.0, breaking dependency resolution on R 4.4.x. This PR applies the fix from PR #507 (drop ggpubr for patchwork) alongside the internet-resource error handling from PR #506.

Changes

Dependency fix (PR #507)

• Replace ggpubr::ggarrange() with patchwork::wrap_plots() in autoplot.seroincidence.by.R and graph_seroresponse_model_1.R
• Swap ggpubr → patchwork in DESCRIPTION Imports; removes transitive ggrepel dependency
• Update vdiffr snapshot for new patchwork layout

Graceful internet resource errors (PR #506)

• load_noise_params() and load_sr_params(): wrap URL loading in tryCatch + withCallingHandlers; emit cli::cli_abort() with class internet_resource_unavailable on failure; re-signal non-URL errors unchanged via rlang::cnd_signal()
• Switch from readRDS() to readr::read_rds(); move readr from Suggests → Imports
• Add tests for URL failure path, non-URL error re-throw, and deprecated load_curve_params()

Misc

• Fix pre-existing stop() → cli::cli_abort() in autoplot.seroincidence.by.R (linter flags modified files)

• Add tests/vdiffr.Rout.fail to .gitignore

• Bump version to 1.4.0.9004

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