feat: field-sync-gui MVP — Wails GUI ingest SD→local+S3 (4 slots //)

frontend/src/App.svelte

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+<script lang="ts">
+  import { onMount } from 'svelte';
+  import { ScanCards, StartIngest, CancelIngest, GetSnapshot, SetDryRun, LoadConfig } from '../wailsjs/go/main/App';
+  import { EventsOn } from '../wailsjs/runtime/runtime';
+
+  let cards: any[] = [];
+  let snapshot: any = { slots: [], running: false, dryRun: false, sessionID: '', config: {} };
+  let dryRun = false;
+
+  async function refresh() {
+    cards = await ScanCards();
+    snapshot = await GetSnapshot();
+  }
+
+  async function start() {
+    const payload = cards.slice(0, 4).map((c: any, i: number) => ({
+      slot: ['A','B','C','D'][i],
+      mountpoint: c.mountpoint,
+    }));
+    await StartIngest(payload);
+  }
+
+  async function cancel() { await CancelIngest(); await refresh(); }
+
+  function toggleDryRun() {
+    dryRun = !dryRun;
+    SetDryRun(dryRun);
+  }
+
+  onMount(() => {
+    refresh();
+    const t = setInterval(refresh, 3000);
+    EventsOn('slot-update', () => refresh());
+    EventsOn('session-done', () => refresh());
+    return () => clearInterval(t);
+  });
+
+  function pct(done: number, total: number) {
+    if (!total) return 0;
+    return Math.round((done / total) * 100);
+  }
+
+  function fmtBytes(b: number) {
+    if (b < 1024) return b + ' B';
+    if (b < 1024*1024) return (b/1024).toFixed(1) + ' KB';
+    if (b < 1024*1024*1024) return (b/1024/1024).toFixed(1) + ' MB';
+    return (b/1024/1024/1024).toFixed(2) + ' GB';
+  }
+</script>
+
+<div class="min-h-screen p-6 flex flex-col gap-6">
+  <header class="flex items-center justify-between border-b border-slate-700 pb-4">
+    <div>
+      <h1 class="text-3xl font-bold text-cyan-400">field-sync</h1>
+      <p class="text-sm text-slate-400">Cosma terrain · SD → local + S3</p>
+    </div>
+    <div class="text-right text-xs text-slate-400">
+      <div>Session: <span class="text-slate-200">{snapshot.sessionID || '—'}</span></div>
+      <div>Bucket: <span class="text-slate-200">{snapshot.config?.s3Bucket || '—'}</span></div>
+      <div>Dest: <span class="text-slate-200">{snapshot.config?.localDest || '—'}</span></div>
+    </div>
+  </header>
+
+  <section class="grid grid-cols-2 gap-4">
+    {#each ['A','B','C','D'] as letter, i}
+      {@const s = (snapshot.slots && snapshot.slots[i]) || { slot: letter, status: 'idle' }}
+      {@const card = cards[i]}
+      <div class="bg-slate-800 rounded-2xl p-5 border border-slate-700 shadow-lg">
+        <div class="flex items-center justify-between mb-3">
+          <div class="text-2xl font-bold text-cyan-300">SLOT {letter}</div>
+          <span class="px-3 py-1 rounded-full text-xs font-mono uppercase tracking-wider"
+                class:bg-slate-700={s.status==='idle'}
+                class:bg-blue-700={s.status==='copying'||s.status==='scanning'}
+                class:bg-amber-600={s.status==='uploading'}
+                class:bg-emerald-700={s.status==='done'}
+                class:bg-red-700={s.status==='error'}>{s.status || 'idle'}</span>
+        </div>
+        {#if card}
+          <div class="text-sm text-slate-300 mb-1 truncate">{card.label || card.mountpoint}</div>
+          <div class="text-xs text-slate-500 mb-3 truncate">{card.mountpoint}</div>
+        {:else}
+          <div class="text-sm text-slate-500 italic mb-3">— vide —</div>
+        {/if}
+        <div class="space-y-2">
+          <div>
+            <div class="flex justify-between text-xs text-slate-400">
+              <span>Fichiers</span><span>{s.filesDone || 0} / {s.filesTotal || 0}</span>
+            </div>
+            <div class="w-full bg-slate-700 rounded h-2 overflow-hidden">
+              <div class="h-full bg-cyan-500 transition-all" style="width: {pct(s.filesDone, s.filesTotal)}%"></div>
+            </div>
+          </div>
+          <div>
+            <div class="flex justify-between text-xs text-slate-400">
+              <span>Octets</span><span>{fmtBytes(s.bytesDone || 0)} / {fmtBytes(s.bytesTotal || 0)}</span>
+            </div>
+            <div class="w-full bg-slate-700 rounded h-2 overflow-hidden">
+              <div class="h-full bg-emerald-500 transition-all" style="width: {pct(s.bytesDone, s.bytesTotal)}%"></div>
+            </div>
+          </div>
+          {#if s.speedMBs}<div class="text-xs text-slate-400">{s.speedMBs.toFixed(1)} MB/s</div>{/if}
+          {#if s.error}<div class="text-xs text-red-400 mt-1">⚠ {s.error}</div>{/if}
+        </div>
+      </div>
+    {/each}
+  </section>
+
+  <footer class="flex gap-3 items-center mt-auto border-t border-slate-700 pt-4">
+    <button on:click={refresh} class="px-5 py-3 bg-slate-700 hover:bg-slate-600 rounded-lg font-semibold">↻ Rescan</button>
+    <button on:click={start} disabled={snapshot.running || cards.length===0}
+            class="px-6 py-3 bg-cyan-600 hover:bg-cyan-500 disabled:bg-slate-700 disabled:text-slate-500 rounded-lg font-bold text-lg">
+      ▶ START INGEST
+    </button>
+    <button on:click={cancel} disabled={!snapshot.running}
+            class="px-5 py-3 bg-red-700 hover:bg-red-600 disabled:bg-slate-700 disabled:text-slate-500 rounded-lg font-semibold">
+      ✕ Cancel
+    </button>
+    <label class="flex items-center gap-2 ml-4 text-sm cursor-pointer">
+      <input type="checkbox" bind:checked={dryRun} on:change={toggleDryRun} class="w-4 h-4">
+      Dry-run
+    </label>
+    <div class="ml-auto text-xs text-slate-500">{cards.length} carte(s) détectée(s)</div>
+  </footer>
+</div>

frontend/src/assets/fonts/OFL.txt

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+Copyright 2016 The Nunito Project Authors (contact@sansoxygen.com),
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
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+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
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+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
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+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
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+Permission is hereby granted, free of charge, to any person obtaining
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+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
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frontend/src/main.ts

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+import './style.css'
+import App from './App.svelte'
+
+const app = new App({
+  target: document.getElementById('app')
+})
+
+export default app

frontend/src/style.css

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+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+html, body { @apply bg-slate-900 text-slate-100 h-full m-0; font-family: system-ui, sans-serif; }

frontend/src/vite-env.d.ts

@@ -0,0 +1,2 @@
+/// <reference types="svelte" />
+/// <reference types="vite/client" />