Add dashboard UI foundation and map export workflow

web/src/pages/home/Home.tsx

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+import { A } from '@solidjs/router'
+import './home.css'
+
+const tools = [
+  ['/station','Monitor','Stations','Inspect recent measurements on a map and open detailed station charts.','◉'],
+  ['/cities','Analyse & export','City analysis','Compare cities, aggregate values, and prepare map graphics.','▦'],
+  ['/latvia','Summarise','Latvia overview','Review country-wide minimum, maximum, average, and total values.','⌁'],
+  ['/database','Browse','Data archive','Find available dates and inspect individual hourly records.','▤'],
+  ['/harmonie','Forecast model','HARMONIE','Render forecast fields from locally stored HARMONIE GRIB files.','◫'],
+  ['/lvgmc-forecast','Forecast products','LVĢMC forecast','Open prepared LVĢMC city forecasts and broadcast tables.','☁'],
+]
+export function Home() { return <section class="homePage"><div class="homeHero"><div><p class="eyebrow">Weather data and production tools</p><h1>Choose a workspace</h1><p class="heroCopy">Explore station history, compare cities, inspect forecasts, or prepare weather graphics from one place.</p></div><div class="environmentBadge"><span class="statusDot"/>Development dataset<small>Synthetic station observations are active</small></div></div><div class="toolGrid">{tools.map(([path,eyebrow,title,description,icon]) => <A class="toolCard" href={path}><span class="toolIcon">{icon}</span><span class="eyebrow">{eyebrow}</span><h2>{title}</h2><p>{description}</p><span class="cardAction">Open workspace →</span></A>)}</div></section> }

web/src/pages/home/home.css

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+.homePage{max-width:1440px;margin:auto;padding:56px 32px 80px}.homeHero{display:flex;justify-content:space-between;align-items:end;gap:48px;margin-bottom:40px}.homeHero h1{margin:8px 0 14px;font-size:clamp(38px,5vw,68px);line-height:.98;letter-spacing:-.045em}.heroCopy{max-width:720px;margin:0;color:var(--text-muted);font-size:18px;line-height:1.6}.eyebrow{color:var(--accent-strong);font-size:12px;font-weight:700;letter-spacing:.12em;text-transform:uppercase}.environmentBadge{min-width:250px;padding:16px 18px;border:1px solid var(--border);border-radius:14px;background:var(--surface);font-weight:700;box-shadow:var(--shadow-sm)}.environmentBadge small{display:block;margin:5px 0 0 18px;color:var(--text-muted);font-weight:400}.statusDot{display:inline-block;width:9px;height:9px;margin-right:9px;border-radius:50%;background:var(--success);box-shadow:0 0 0 4px rgba(38,147,104,.12)}.toolGrid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.toolCard{position:relative;min-height:230px;padding:26px;overflow:hidden;border:1px solid var(--border);border-radius:18px;background:var(--surface);color:var(--text);text-decoration:none;box-shadow:var(--shadow-sm);transition:.18s}.toolCard:hover{transform:translateY(-3px);border-color:var(--accent-soft);box-shadow:var(--shadow-md)}.toolCard h2{margin:28px 0 10px;font-size:24px}.toolCard p{max-width:90%;margin:0;color:var(--text-muted);line-height:1.55}.toolIcon{position:absolute;top:20px;right:22px;color:var(--accent);font-size:31px}.cardAction{position:absolute;bottom:24px;left:26px;font-weight:700}@media(max-width:960px){.toolGrid{grid-template-columns:repeat(2,1fr)}.homeHero{align-items:start;flex-direction:column}}@media(max-width:640px){.homePage{padding:36px 18px}.toolGrid{grid-template-columns:1fr}}