Phase 2, part 4. Baseline 50 -> 15.
Migrated: all eight calculators, the rest of inventory and collections, the
Map/Zim/Docs cluster, Videos, Files, Search, Archive, DashboardPage,
DatesSelector, HelpModal, Events, Tags, Flasher's neighbours, admin Settings
and Status, Download, and App.
Also the three shared modules everything imports: api.js and customHooks.js
swap the Semantic toast library for the library's shim (same call shape), and
useForm.js renders the library's Message. useForm accepts both the old
`{content, header, positive|negative}` shape and the new `{kind, title}`,
because the pages building those objects migrate separately.
Two library gaps closed, both found by call sites needing them:
ActionInput is a forwardRef now. Its ref reaches the input rather than the
wrapper, because callers use it to focus or select the field -- a ref to the
surrounding div would do neither, which is why one call site had resorted to
hand-copying the component's markup.
Header takes a `color` token name. Three separate call sites had reached for
an inline style to colour a heading that carries meaning ("3 items to add"
against "2 to remove"), which is how a hex ends up in markup.
Two files needed repair after being interrupted mid-edit: MapViewer had a
Segment left in its error branch, and VideoPlayer had lost the useContext
import its own code still used. Neither jest nor tsc noticed; only
`npm run build` did, which is the whole reason that check exists.
Fifteen files remain: Archive, BulkTagModal, Channels, Docs, FileBrowser,
FilePreview, Flasher, Nav, Playlists, Theme.tsx, Upload, VideoPlayer, Zim,
ControllerPage, admin/Downloads. Theme.tsx is deliberately last -- the
unmigrated files still import its Semantic-backed wrappers, so it can only go
once they have.
Replacing Channels and Domains with Collection.
Moving downloading relationships from Channel to Collection.
Created domains.yaml config to manage tagged domain collections.
Adding turn-key upgrade solution in the UI.
