ODIAN Launcher: hub, installer, local stack and remembered sign-in (M2)

- Tauri 2 + Svelte 5 hub in ODIAN dark: patch notes and roadmap, install and
  update progress, local stack status, settings with DHP and MCP addresses.
- crates/odian-packs: Rust installer for pack format v1 (signed manifests,
  resumable verified downloads from a DHP or an ODIAN drive), byte-compatible
  with ODIAN_MCP_Server's Python odian_packs.
- Local stack on 127.0.0.1: Postgres -> Engine API -> tile server -> Odian.exe,
  one Job Object, clean shutdown; database snapshot restore on a fresh PC only.
- Keycloak sign-in through the DHP's MCP, remembered until Sign out with a
  launcher session that renews the Engine token silently.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/components/ProgressBar.svelte

@@ -0,0 +1,80 @@
+<script lang="ts">
+  interface Props {
+    /** 0..1, or null for indeterminate. */
+    value: number | null;
+    label: string;
+    valueText?: string;
+  }
+
+  let { value, label, valueText }: Props = $props();
+
+  const percent = $derived(value === null ? null : Math.round(Math.min(1, Math.max(0, value)) * 1000) / 10);
+</script>
+
+<div
+  class="bar"
+  class:indeterminate={percent === null}
+  role="progressbar"
+  aria-label={label}
+  aria-valuemin={0}
+  aria-valuemax={100}
+  aria-valuenow={percent ?? undefined}
+  aria-valuetext={valueText}
+>
+  {#if percent === null}
+    <span class="sweep"></span>
+  {:else}
+    <span class="fill" style:width="{percent}%"></span>
+  {/if}
+</div>
+
+<style>
+  .bar {
+    position: relative;
+    height: 4px;
+    overflow: hidden;
+    background: var(--line);
+  }
+
+  .fill {
+    position: absolute;
+    inset: 0 auto 0 0;
+    background: var(--accent);
+    box-shadow: 0 0 14px rgba(91, 140, 255, 0.6);
+    transition: width var(--dur) linear;
+  }
+  .fill::after {
+    content: "";
+    position: absolute;
+    top: 0;
+    right: 0;
+    bottom: 0;
+    width: 2px;
+    background: #d6e2ff;
+  }
+
+  .sweep {
+    position: absolute;
+    top: 0;
+    bottom: 0;
+    left: -35%;
+    width: 35%;
+    background: linear-gradient(90deg, transparent, var(--accent), transparent);
+    animation: sweep 1.8s var(--ease) infinite;
+  }
+
+  @keyframes sweep {
+    to {
+      left: 100%;
+    }
+  }
+
+  @media (prefers-reduced-motion: reduce) {
+    .sweep {
+      left: 0;
+      width: 100%;
+      opacity: 0.5;
+      background: repeating-linear-gradient(90deg, var(--accent) 0 10px, transparent 10px 18px);
+    }
+  }
+</style>