Add icons to model types - #6865

Model types can carry a Lucide icon and a colour, so they are recognisable at a
glance instead of being told apart by name alone. Both live in public metadata on
PageType, under `dashboard-icon-name` and `dashboard-icon-color`.

PageTypeUpdateInput carries no metadata, so the icon rides a second call on submit.
`createMetadataCreateHandler` could not be reused: it hardcodes `keysToDelete: []`,
which would leave "Reset" a silent no-op. `UpdateMetadata` carries both halves in one
round trip and merges by key, so clearing works and unrelated metadata is untouched.

Icons resolve through `dynamicIconImports`, which keeps all ~1900 icon modules alive.
The blanket `node_modules -> "vendor"` chunk rule would then inline every one of them
into the main bundle, measured at +757kB minified against origin/main. An explicit
chunk per icon keeps them out: vendor grows 20kB gzipped and a rendered icon costs
about 700 bytes. The cost is 1651 extra files in dist.

The datagrid paints on canvas and cannot await an import, so it draws the fallback
glyph and repaints once the visible page's icons land, rather than blocking the list.
Lucide ships each icon's raw node data next to the component, so the existing
`iconNodeToSvg` and `drawIconLabelCell` cover the cell.

Types without an icon render a neutral `Shapes` fallback, which is imported statically
and doubles as the placeholder for the frame before a name resolves — the icon slot
never renders empty and never reflows.

Picker results are capped at 60 rather than virtualised, since every rendered tile
fires its own lazy import.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

…e-icons

# Conflicts:
#	src/graphql/hooks.generated.ts
#	src/modeling/components/PageListPage/PageListPage.tsx

The picker was switched to the shared `buttonMessages.reset` after messages were
last extracted, leaving its own "Reset" entry orphaned in defaultMessages.json.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

…e-icons

# Conflicts:
#	src/attributes/utils/data.ts
#	src/modelTypes/components/PageTypeList/PageTypeList.tsx
#	src/modelTypes/views/PageTypeDetails.tsx
#	src/modeling/components/ModelTypeTabs/ModelTypeTabs.tsx
#	src/modeling/components/PageListDatagrid/PageListDatagrid.tsx
#	src/modeling/views/PageList/PageList.tsx
#	src/navigationPins/components/NavigationPinButton.tsx
#	src/navigationPins/components/NavigationPinList.tsx
#	src/navigationPins/hooks/usePinnedModelTypeNames.ts
#	src/navigationPins/hooks/useResolvedNavigationPins.ts

…r trigger

Reference rows in the assign dialog listed models by name alone, so the icon that
identifies a model type everywhere else stopped at the dialog boundary. `SearchPages`
already selects the type's metadata, so no extra fetch is needed.

The adornment is a render prop on the dialog rather than a field on `Container`:
that shape doubles as the submit payload, and putting React nodes into submitted
data would leak presentation into every assign handler. Rows resolve the icon per
row instead.

The picker trigger is now an explicit square. `aspect-ratio` cannot do this here —
as a flex item its width resolves from content before `align-self: stretch` makes
the height definite, so the ratio had nothing to compute from and it rendered 34x52
against the input's 52.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>