Add Additional Analysis slides to exported PPT/QMD results decks

[Copilot]

This PR extends slide exports so the app’s Additional Results (matrix ratios and excretion summary) are included in both results_slides.pptx and results_slides.qmd, under a dedicated section at the end of the deck.

• Slide export wiring

  • inst/shiny/functions/zip-utils.R
  • .export_slides() now forwards additional analysis outputs (matrix_ratios, excretion_results) into the slide-generation pipeline via res_dose_slides metadata.

• PPT output updates

  • R/officer-utils.R
  • create_pptx_dose_slides() now appends:
    • a separator title slide: “Additional Analysis Figures”
    • table slide(s) for available non-empty datasets:
      • Matrix Ratios
      • Excretion Summary

• QMD output updates

  • R/quarto-utils.R
  • create_qmd_dose_slides() now:
    • persists additional_analysis with res_dose_slides in results_slides_outputs.rda
    • appends a section slide: “Additional Analysis Figures”
    • appends per-table slides for:
      • matrix_ratios
      • excretion_summary

• Focused coverage

  • tests/testthat/test-quarto-utils.R
  • Adds targeted assertions for:
    • section/slides present when additional analysis data exists
    • section omitted when no additional analysis tables are available

attr(res_dose_slides, "additional_analysis") <- list(
  matrix_ratios = additional_analysis$matrix_ratios,
  excretion_summary = additional_analysis$excretion_results
)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Enhancement: Add additional analysis results in PPT</issue_title>
<issue_description>### Description
The Additional Results in the App (matrix ratios, excretion summary) when run could be added to the PPT result_slides.pptx and the respective result_slides.qmd at the end of the document in a section separated by a slide called "Additional Analysis Figures"

Definition of Done

The requirements for the feature to be complete:

• Add Additional Results to the PPT
  </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Enhancement: Add additional analysis results in PPT #971

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