Unify color palette + redesign Metadata page + plotly conversion

[eboyer221]

Description

Follow-up PR after closing #14 - Fixes color palette, Metadata page redesign, plotly conversion of remaining static plots.

Changes

• Three unified palette constants (SCALE_COLORS, PHENOTYPE_COLORS, META_COLORS). Susceptible is intentionally grey so Resistant contrasts.
• Metadata tile redesign: quickStatBox adds an icon_name param; makeQuickStats is now 3×3 tiles with muted colors and icons.
• Metadata plots → plotly: makeDatAvailabilityPlot, makeTimeSeriesAMRPlot, makeHostIsolatePlot, makeIsolationSourcesPlot wrapped with ggplotly + per-mark hover text. Same fonts across all four (theme_bw, 10pt axis, 12/10pt legend). Phenotype plots use PHENOTYPE_COLORS; host + source use META_COLORS. Matching UI/server updates in R/app.R.
• Dynamic Isolation/Hosts header: header above the bottom-right tabBox on the Metadata page now swaps title text when the active tab changes between 'Hosts' or 'Isolation Sources'.
• **Model Performance plot rebuilt with native plot_ly.

Regenerated NAMESPACE and DESCRIPTION with devtools::document().

Test plan

1. devtools::load_all() then launchAMRDashboard().
2. Metadata tab:
   • 3×3 redesigned tiles with icons; Susceptible tile is grey.
   • Data availability + Time series plots: Resistant amber, Susceptible grey, all interactive with hover tooltips.
   • Host + Isolation source plots: muted categorical palette, interactive.
   • Choropleth: amber gradient, interactive.
   • Sankey: muted palette, Resistant node = amber, Susceptible node = grey.
   • Click between "Isolation sources" and "Hosts" sub-tabs updates header title accordingly.
3. Model Performance tab: three boxes side-by-side at each species position, drug-overlay dots land on their matching box.

Checklist

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[amcim]

Overall this looks good. Just two minor things before merging

1. For META_COLORS in utils.R, there are 11 defined colors. How did you decide on 11 and is it guaranteed there won't be more than 11 hosts/isolation sources/etc? Sfl works fine but if other bacteria can have more then this probably needs to be changed.

2. The DESCRIPTION has this line added RoxygenNote: 7.3.3 but PR Package name change from amRshiny to amRviz + New Visualizations #20 added Config/roxygen2/version: 8.0.0 because roxygen got an update this month and we regenerated documentation there

From the roxygen release notes (https://roxygen2.r-lib.org/news/index.html):

roxygen2 options can now be set using Config/roxygen2/ fields in DESCRIPTION (e.g. Config/roxygen2/markdown: TRUE) 
instead of the Roxygen field. The old Roxygen field is still supported. 
Similarly, the roxygen2 version is now stored in Config/roxygen2/version.
roxygen2 will migrate this automatically the next time you document.

So basically we should only need the Config line now as it migrated for us earlier
Note also I noticed this (2) in PR #25 as well