Segments phase 2: /segments/ browse page, /segments/new/ creation flow, activity detail shortcut

site/src/pages/segments/index.astro

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+---
+import Base from '../../layouts/Base.astro';
+import SegmentsView from '../../components/SegmentsView.svelte';
+---
+<Base title="Segments — BincioActivity">
+  <div class="flex flex-col" style="height: calc(100vh - 48px);">
+    <SegmentsView base={import.meta.env.BASE_URL} client:only="svelte" />
+  </div>
+</Base>

site/src/pages/segments/new/index.astro

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+---
+import Base from '../../../layouts/Base.astro';
+import SegmentCreate from '../../../components/SegmentCreate.svelte';
+---
+<Base title="New Segment — BincioActivity">
+  <SegmentCreate base={import.meta.env.BASE_URL} client:only="svelte" />
+</Base>