Move the console onto ReUI PRO

Install ReUI (MCP, skill, @reui registry, Tailwind v4, shadcn base-nova) and move
the shared UI onto it: Button, Tag, Check, Input/Textarea, Segmented, Alert, Panel,
Dialog, Tooltip, Menu and Select (Popover), Toast (sonner), the Table frame
(DataGrid), the Dashboard KPI strip, the shnt Ops palette, Geist and the type scale.

Design only: behaviour, texts and roles are unchanged. Tests that asserted the old
DOM were updated; the tests now format numbers in English wherever they run.
docs/reui-migration-plan.md records the plan and its decisions.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

dev/README-parity.md

@@ -0,0 +1,51 @@
+# Parity checks
+
+## `check-parity-actions.sh`: the one that actually counts
+
+Runs **the same action on both instances** and compares the state the server is
+left in, not the bytes of the page. This is the check that makes the project's
+governing constraint enforceable: since behaviour does not change, if the body
+the new console sends differs by one parameter, the record left behind differs
+and it shows up here.
+
+```bash
+docker compose up -d
+./check-parity-actions.sh
+```
+
+It covers fourteen actions: seven creates (including the awkward ones: split TXT,
+SVCB with flattened `svcParams`, CAA with its default values), three edits
+(among them disabling a record, which upstream does as a `records/update`
+resending the whole record), three deletes (including CNAME, which falls to the
+`default` branch and sends no identity parameter at all) and the `options/set`
+with all six empty lists travelling as the string `"false"`.
+
+It normalises three things before comparing, and all three because they are not
+parity: `lastModified`, the SOA serial and **the server's own name**, which is
+embedded in the NS and SOA of every zone and is deliberately different in each
+container.
+
+## `check-parity.sh`: only for the preserved files
+
+Compares the content of a path between the two instances. The console is ours,
+so **for `/` it reports `DIFFERENT` and that is the point of the project**. It
+still serves for what the build preserves untouched:
+
+```bash
+./check-parity.sh /robots.txt   # IDENTICAL
+./check-parity.sh /favicon.ico  # IDENTICAL
+```
+
+## `parity-login.mjs`
+
+Compares the alerts on the login screen between the new console (5380) and
+upstream's (5381). Needs Playwright:
+
+```bash
+npm i -D playwright && npx playwright install chromium
+node parity-login.mjs
+```
+
+It found two real divergences the first time it ran: the "×" button to dismiss
+the alert was missing, upstream has it, so its absence was a behavioural
+difference, and so was the space between the title and the text.