Load amCharts and the heavy admin plugins only where they're used

[rbruhn]

Loads amCharts and the heavy admin plugins only on the pages that use them, now that the build is Vite (#562).

amCharts

Both layouts included common/amchart.blade.php on every page: amCharts core, charts, the animated theme, maps and the world and US map data from amcharts.com, about 450 kB compressed, only so the WeDigBio rate modal in the menu could draw its chart.

• common/amchart.blade.php is now just the CDN tags, with the map libraries behind ['maps' => true].
• Pages that draw a chart include it before their chart bundle: the project page (with maps when it shows the transcription and map charts), front events and event pages, admin events and project statistics, and the bingo card (maps).
• The layouts load only the rate modal's script (4 kB). It fetches amCharts core, charts and the theme the first time the modal opens (amcharts-loader.js), and reuses them after that. If the modal is closed before they arrive, it doesn't start its 5-minute refresh.

Admin plugins

The admin bundle carried jqGrid, jQuery UI, Summernote and the datetimepicker on every admin page.

Chunk	Size (compressed)	Loaded when
admin-app (was everything)	94 kB (29 kB), was 786 kB (225 kB)	every admin page
admin-grid: jQuery UI, ui.multiselect, jqGrid, jqgrid.js	632 kB (186 kB)	the page has #jqGridTable (subjects, expedition create, edit, show and clone)
Summernote	172 kB (40 kB)	the page has a .textarea editor
datetimepicker	61 kB (20 kB)	the page has .date-time-picker fields

jQuery UI is only used by the grid's column chooser, so it moves into the grid chunk. Bootstrap-select, bootbox, notify and ClipboardJS stay in the main bundle, since they're used across the admin.

Tested locally (biospex.test)

• yarn build succeeds; php artisan test --compact: 632 passed.
• Front: home, projects and expeditions load no amCharts. The project page loads core, charts, theme, maps and map data, and its 3 charts and map render. Events loads core, charts and theme. On the past WeDigBio events page, Rates fetches amCharts and draws the rate chart; a second event's rates reuse them.
• Admin: the projects list loads none of the lazy chunks. Subjects loads the grid chunk (25 of 139,770 rows; the column chooser opens with data-selected-value). Expedition create loads the grid chunk (25 rows, Livewire managers). Event create loads the datetimepicker (both fields). Project edit loads Summernote (editor and toolbar). Statistics and admin events load amCharts and render.
• No console errors.

To verify on development

See #548.