Redesign the dashboard and sign-in page with the Lightwell design language

Warm neutrals, teal accent, 15px type, and Lightwell's component shapes. Status is a badge with text
instead of a colored dot. Every destructive action asks first, naming the object and what is lost.
Dialogs trap focus, close on Escape and return focus. The sidebar is a drawer on phones, there is a
theme switch, loading shows skeleton rows, and empty states explain what belongs there. Emoji and
dashes are gone, and server errors are capitalized and tell visitors what to do next.
Adds scripts/lint-design.mjs and docs/design.md.

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

docs/design.md

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+# Hammerhead design language
+
+The dashboard and the visitor sign-in page follow the Lightwell design language. The reference is `docs/design.md` in the Lightwell repository. This page records how that language is applied here and where Hammerhead needs its own pieces. When the two disagree, Lightwell's document wins.
+
+## What is shared with Lightwell
+
+* **Tokens.** Colors, spacing (4px scale), radius (6px and 10px), type sizes (12 to 28px), the single shadow and the dark theme are the Lightwell values. The accent is Lightwell's teal, `#1f5c5c`, with white text on it. Everything derived from the accent uses `color-mix`.
+* **Principles.** Quiet neutrals with one accent, plain and specific wording, one way to do each thing, calm density, and WCAG 2.1 AA.
+* **Voice.** No emoji, no em or en dashes, no exclamation marks, sentence case, buttons that name the result, and errors that say what happened and what to do next. Errors that come from the server are capitalized in one place (`fail` in `store.go`).
+* **Status carries text.** A status is a badge with a label ("Online", "Listening", "Down"), never a colored dot on its own.
+
+## Where it lives
+
+| File | What it holds |
+| --- | --- |
+| `web/index.html` | The dashboard. The token block sits between `tokens:begin` and `tokens:end`; raw colors are allowed only there. |
+| `web/resource.html` | The sign-in page that visitors see in front of a protected resource. Same token block. |
+
+Both are single files with no build step, so the token block is repeated in each. Change a token in both.
+
+## Components
+
+Built from the helpers at the top of the script in `web/index.html`. Feature code uses these and does not style one-off.
+
+| Helper | Use |
+| --- | --- |
+| `card`, `pageHeader` | Surfaces and the page title with its one primary action |
+| `field`, `chk` | Label above the control, hint below |
+| `badge(text, tone)` | Status pill. Tones: success, warning, danger, accent, or none for neutral |
+| `emptyState(icon, title, text, action)` | Dashed outline, icon, a title that says "No X yet", one sentence |
+| `modal`, `dialogForm` | Dialogs. Focus moves in, Tab stays inside, Escape closes, focus returns to the opener |
+| `confirmDialog`, `ask` | Every destructive action. The title names the object, the body says what is lost and whether it can be undone |
+| `toast` | Confirmations at the bottom right. Errors stay longer and are announced as alerts |
+| `skeleton` | Placeholder rows while a page loads, not a spinner |
+| `updatePanel` | Progress bar and live log for an update |
+
+## Icons
+
+Lucide style, outline only, stroke 1.75, round caps, `currentColor`. Sizes are 16, 18 and 22 pixels. They are inline in the `ICONS` table. An icon goes with a text label, and icon-only buttons carry an `aria-label`.
+
+Approved names: `fin`, `mine`, `ports`, `sites`, `domains`, `access`, `logs`, `edges`, `orgs`, `users`, `idps`, `settings`, `audit`, `account`, `egress`, `alerts`, `out`, `menu`, `close`, `add`, `check`, `light`, `dark`, `alert`. Add a name here and in `ICONS` together.
+
+## Layout
+
+* Admin content is capped at 1120px. Below 860px the sidebar becomes a slide-in drawer with a top bar, and grids collapse. Phones keep a 16px side gutter.
+* On touch screens controls are at least 44px high and inputs are 16px so the page does not zoom.
+* Motion is minimal and turns off under `prefers-reduced-motion`. The theme follows the system and can be switched from the sidebar.
+
+## Checking a change
+
+```
+node scripts/lint-design.mjs
+```
+
+It fails on em and en dashes, emoji, and raw colors outside the token block, in the pages, the docs and the Go source. Then check the page in light and dark, at phone and desktop width, using only the keyboard.