feat: move plot/table modules, modal, dropdown and navigation in from OPG

[ESCRI11]

Companion PR: bigomics/omicsplayground# — merge this one first.

What this does

Moves PlotModule, TableModule and their supporting UI out of Omics Playground and into bigdash, so a standalone BigOmics app can use them without dragging in OPG.

Arriving here:

	from
PlotModuleUI / PlotModuleServer, plotlyExport, visPrint	ui-PlotModule.R
TableModuleUI / TableModuleServer, CardUI, ui.DataTable, trunc_display_row, color_from_middle	ui-TableModule2.R, ui-colors.R
DropdownMenu	ui-DropDownMenu.R
modalUI / modalTrigger	ui-modalUI.R
the bigdash.* navigation API	ui-bigdashplus.R
the module CSS, and the JS behind them	scss/, www/temp.js + 3 helpers

Also folds in the styling OPG kept under the comment "THESE CHANGES SHOULD EVENTUALLY BE MOVED TO BIGDASH", merged into the matching bigdash partials rather than appended as a second layer.

Decoupling from OPG

The modules reached directly for opt$WATERMARK, FILES, tspan, getEditorContent, record_plot_download, addSettings, addWatermark.* and COLOR_THEME_MAPPING. Those are now looked up as options via bd_hook(), each with a no-op fallback, so bigdash works standalone and OPG registers its own implementations at startup. None of those OPG globals appear in this package any more (verified with codetools::findGlobals).

inst/examples/standalone.R is a runnable demo — full dashboard, two PlotModules and a TableModule over base R datasets, no OPG present. SMOKE=TRUE Rscript inst/examples/standalone.R runs it as a render-only self-check.

Not a pure move

Three CSS declarations are added, needed for a standalone app to match OPG:

• .btn padding vars and html body { font-size: 14px } — moved from OPG's _all.scss
• .btn.btn-circle-xs sizing — this was never OPG's; it comes from shinyWidgets, which OPG happens to load. Declared here (same values) rather than taking the dependency for six declarations.

Verification

• CSS coverage — 102 of 105 declarations removed from OPG are present here; the other 3 are verified equivalents (#004CA7/#004ca7, black/#000, and the deliberate img/mascotte-sc.png path). Zero declarations added to OPG.
• Generated HTML — identical for all 14 module variants vs pre-migration, excluding three known causes: a console.log dropped from modalUI, the dropdown-helper.js tag now in this bundle, and bslib's random accordion ids (proved nondeterministic by rendering the same tree twice).
• All 28 board tabs compared pre/post in the real app on identical data: every rendered board identical on card geometry, header boxes, buttons, titles and captions.
• R CMD check vs origin/master: WARNINGs 3 → 1, ERROR and NOTE unchanged. The remaining ERROR (hover_dropdown example) and WARNING (bs_alert/navbar/navbarDropdown args) are pre-existing and identical on master.

Known behavioural deltas

• dbg() → message() in two download handlers — log formatting only.
• input$get_pdf_settings is now isTRUE(...); a NULL used to error and abort the PDF download.
• console.log('Modal event:'…) removed from modalUI(track_open = TRUE).
• editor = TRUE without a registered bigdash.editor_content hook now warns and drops the button instead of rendering one that opens an empty modal.

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🔎 What we're asking reviewers to confirm

The one thing that matters: Omics Playground must look and behave exactly as it did before. This is a code move, not a redesign. Please try to prove that wrong.

Highest-value checks, roughly in order:

1. Run OPG and compare against edgy. make run, load the example dataset, and walk the boards you know best. Every plot/table card should be pixel-identical: header height, the info/options/download/zoom buttons, title, caption, the fullscreen zoom modal, downloads (PNG/PDF/CSV), and the plot editor.
2. Boards we could not render. The example dataset produces no cards on cell, deepnet, drug, ideograms, lasagna, mgsea, mofa, snf. Those 8 are argued-correct (no board source was touched) but never observed. If you have a dataset that exercises any of them, that's the most useful thing you can do on this PR.
3. Module-driven navigation. An earlier version of this branch broke every bigdash.* call made from inside a Shiny module — the Welcome page's upload buttons, and the jump to load-tab after a compute finishes. Fixed and tested, but please exercise those paths: Welcome → "Load new data", and a full upload → compute → load cycle.
4. The plot editor, which now reaches OPG through a hook: colour pickers, palette selection, click-to-label on plotly and ggplot/base plots, and the reset button.
5. Watermarking and PDF settings, also hook-driven — download a PDF with WATERMARK = TRUE and confirm the stamp and the appended settings table.

Differences inside plots (colour palettes) are expected and out of scope — the palette helpers stayed in OPG. It's the box around the plot that this PR moves.

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▶️ Try a standalone app in 30 seconds

No Omics Playground anywhere. Copy-paste into R — this exact script was run and screenshotted; its card chrome measures identical to OPG's (header 33px, buttons 19×19, body font 14px).

remotes::install_github("bigomics/bigdash@feat/bigdash-modules")

library(shiny)
library(bigdash)

ui <- bigPage(
  title    = "mini",
  navbar   = navbar("My App"),
  sidebar  = sidebar("Menu", sidebarItem("Plot", "p-tab")),
  settings = settings("Settings"),
  bigTabs(
    bigTabItem(
      "p-tab",
      tabSettings(sliderInput("bins", "Bins", 5, 50, 20)),
      PlotModuleUI(
        "hist",
        title     = "Old Faithful",
        info.text = "Waiting times between eruptions.",
        caption   = "A base R histogram in a BigOmics card.",
        plotlib   = "base",
        height    = c(400, 800)
      )
    )
  )
)

server <- function(input, output, session) {
  PlotModuleServer(
    "hist",
    plotlib = "base",
    func    = function() {
      hist(faithful$waiting, breaks = input$bins, col = "#3181de",
           border = "white", main = "", xlab = "waiting (min)")
    },
    csvFunc = function() faithful
  )
}

shinyApp(ui, server)

You get the full BigOmics card: info popover, download menu, fullscreen zoom, caption footer, sidebar navigation and a settings drawer driving the plot — from library(bigdash) alone.

For a fuller demo (plotly + base + a TableModule, navigation API buttons): Rscript inst/examples/standalone.R.