## What this PR does
Redesigns the portal home to match the marketing demo, across all tiers.
- Swapped the old rotating welcome carousel for a static **welcome
hero** on the free tier
- Subscribed (Processor) + enterprise get a **deployed-editor hero** —
shows the live instance (host, version, active users) with an *Open in
browser* button, pulled from the real editor-deployment API (same data
the Editor admin page uses)
- Added a time-of-day **greeting** on the paid tiers
- Rebuilt the **"Finish setting up" checklist** so it's real: the counts
and tick-offs come from the actual policies + sources (a step is done
when there's at least one), not hardcoded numbers
- *Download the PDF Editor* → `https://stirling.com/download`; the other
steps deep-link to Policies / Sources
- **Procurement is now a bolt-on to any tier** — if a deal's in flight
the deal-status hero drops into the hero's footer, otherwise you get the
setup checklist
- All new copy is translated (en-US) and it reuses the shared UI kit,
icons and design tokens
## Tidy-ups / fixes found along the way
- The subscribed hero was shadowing the real `/v1/editor/deployment`
endpoint (broke the Editor admin page) — now reuses it
- Renamed the hero's CSS namespace to `.portal-welcome` so it stops
clashing with the procurement hero's `.portal-hero`
- Refactored the merged procurement component into a shared
`useProcurement` hook + banner + flow, so the deal hero can live inside
the tier hero — `/procurement` route unchanged
## Screenshots
<img width="1258" height="1338" alt="pr-free"
src="https://github.com/user-attachments/assets/9bb7db44-5f8e-4388-857a-7f113c2d7d82"
/>
<img width="1258" height="862" alt="pr-enterprise"
src="https://github.com/user-attachments/assets/f1f36faa-1467-404e-9036-dab12e3d0b54"
/>
<img width="1258" height="944" alt="pr-subscribed"
src="https://github.com/user-attachments/assets/775f1228-f182-47b5-82ff-7ac6d5932bd9"
/>
---
## Checklist
### General
- [x] I have performed a self-review of my own code
- [x] My changes generate no new warnings
### UI Changes
- [x] Screenshots demonstrating the UI changes are attached
### Testing
- [x] Portal typecheck, ESLint and Prettier pass on the changed files
- [x] Verified all states in Storybook and ran the app locally via `task
dev:portal`
