feat: pré-visualização completa, tema, nova identidade e correções (0.2.0)

- Preview de imagem, vídeo/MP4, áudio, PDF (pdf.js), texto, Office/ODF, ZIP e hex,
  lido sob demanda com Range; tela cheia com navegação por teclado.
- Seletor de tema Auto/Claro/Escuro persistido (vale também como administrador).
- Identidade verde-azulada com logo de pixels que formam um lobo.
- Corrige reinício como administrador no AppImage (usa $APPIMAGE) e mostra o motivo.
- Corrige barra inferior piscando (render idempotente, barra criada uma vez).
- Corrige FAT32 em mídias pequenas não reconhecido.

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

apps/gui/ui/app.css

@@ -7,10 +7,10 @@
   --text-2: #6e6e73;
   --text-3: #8e8e93;
   --line: rgba(0, 0, 0, 0.09);
-  --accent: #d9541e;
-  --accent-2: #ff8a3d;
+  --accent: #0f766e;
+  --accent-2: #14b8a6;
   --accent-ink: #ffffff;
-  --accent-soft: rgba(217, 84, 30, 0.1);
+  --accent-soft: rgba(15, 118, 110, 0.11);
   --ok: #1a8f3c;
   --warn: #b26a00;
   --bad: #d12b2b;
@@ -34,10 +34,10 @@
     --text-2: #a1a1a6;
     --text-3: #7d7d82;
     --line: rgba(255, 255, 255, 0.1);
-    --accent: #ff7a3d;
-    --accent-2: #ff9d5c;
-    --accent-ink: #1a0b03;
-    --accent-soft: rgba(255, 122, 61, 0.15);
+    --accent: #2dd4bf;
+    --accent-2: #5eead4;
+    --accent-ink: #042f2e;
+    --accent-soft: rgba(45, 212, 191, 0.15);
     --ok: #32d74b;
     --warn: #ffb340;
     --bad: #ff6961;
@@ -48,6 +48,32 @@
   }
 }
 
+:root[data-theme="dark"] {
+  --bg: #000000;
+  --surface: #1c1c1e;
+  --surface-2: #232326;
+  --side: rgba(28, 28, 30, 0.8);
+  --text: #f5f5f7;
+  --text-2: #a1a1a6;
+  --text-3: #7d7d82;
+  --line: rgba(255, 255, 255, 0.1);
+  --accent: #2dd4bf;
+  --accent-2: #5eead4;
+  --accent-ink: #042f2e;
+  --accent-soft: rgba(45, 212, 191, 0.15);
+  --ok: #32d74b;
+  --warn: #ffb340;
+  --bad: #ff6961;
+  --ok-soft: rgba(50, 215, 75, 0.15);
+  --warn-soft: rgba(255, 179, 64, 0.15);
+  --bad-soft: rgba(255, 105, 97, 0.15);
+  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.4);
+}
+
+:root { color-scheme: light dark; }
+:root[data-theme="light"] { color-scheme: light; }
+:root[data-theme="dark"] { color-scheme: dark; }
+
 * { box-sizing: border-box; }
 html, body { height: 100%; }
 body {
@@ -211,7 +237,8 @@ input[type="checkbox"] { accent-color: var(--accent); width: 17px; height: 17px;
 .kv { display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; font-size: 13.5px; }
 .kv dt { color: var(--text-3); } .kv dd { margin: 0; overflow-wrap: anywhere; }
 
-.actionbar { position: fixed; left: var(--side-w); right: 0; bottom: 0; padding: 14px 24px calc(14px + env(safe-area-inset-bottom)); display: flex; gap: 12px; align-items: center; justify-content: center; background: var(--side); backdrop-filter: saturate(180%) blur(24px); -webkit-backdrop-filter: saturate(180%) blur(24px); border-top: 1px solid var(--line); z-index: 5; animation: rise .3s; }
+.actionbar { position: fixed; left: var(--side-w); right: 0; bottom: 0; padding: 14px 24px calc(14px + env(safe-area-inset-bottom)); display: flex; gap: 12px; align-items: center; justify-content: center; background: var(--side); backdrop-filter: saturate(180%) blur(24px); -webkit-backdrop-filter: saturate(180%) blur(24px); border-top: 1px solid var(--line); z-index: 5; }
+.actionbar.enter { animation: rise .3s; }
 .actionbar .info { color: var(--text-2); font-size: 14px; }
 
 dialog { border: 0; border-radius: 22px; padding: 26px; width: min(520px, calc(100vw - 32px)); background: var(--surface); color: var(--text); box-shadow: 0 30px 80px rgba(0, 0, 0, .35); }
@@ -255,3 +282,53 @@ code, .mono { overflow-wrap: anywhere; font-family: var(--mono); font-size: .92e
 @media (prefers-reduced-motion: reduce) {
   * { animation: none !important; transition: none !important; }
 }
+
+/* ------------------------------------------------------------ tema */
+.theme-switch { display: inline-flex; padding: 2px; border-radius: 999px; background: color-mix(in srgb, var(--text) 8%, transparent); }
+.theme-switch button { border: 0; background: transparent; cursor: pointer; padding: 4px 10px; border-radius: 999px; font-size: 12px; color: var(--text-2); }
+.theme-switch button[aria-pressed="true"] { background: var(--surface); color: var(--text); box-shadow: 0 1px 3px rgba(0, 0, 0, .18); font-weight: 600; }
+
+/* ------------------------------------------------------------ pré-visualização */
+.viewer { position: relative; min-height: 160px; max-height: 52vh; overflow: auto; border-radius: 12px; background: var(--surface-2); box-shadow: inset 0 0 0 1px var(--line); display: flex; flex-direction: column; align-items: center; }
+.viewer.large { max-height: none; height: 100%; min-height: 0; }
+.viewer > * { max-width: 100%; }
+.pv-img { display: block; max-width: 100%; max-height: 46vh; object-fit: contain; margin: auto; }
+.viewer.large .pv-img { max-height: 100%; }
+.viewer.zoomable .pv-img { cursor: zoom-in; }
+.viewer.actual .pv-img { max-width: none; max-height: none; cursor: zoom-out; }
+.viewer.actual { align-items: flex-start; }
+.pv-video { width: 100%; max-height: 46vh; background: #000; border-radius: 12px; }
+.viewer.large .pv-video { max-height: 100%; height: 100%; }
+.pv-audio { width: calc(100% - 24px); margin: auto 12px; }
+.pv-note { width: 100%; padding: 8px 12px; font-size: 12.5px; color: var(--text-2); text-align: center; }
+.pv-note.bad { text-align: left; color: var(--text); background: var(--warn-soft); border-radius: 10px; margin: 8px; width: calc(100% - 16px); font-size: 13.5px; }
+.pv-loading { height: 160px; display: grid; place-items: center; width: 100%; }
+.pv-loading i { width: 26px; height: 26px; border-radius: 50%; border: 3px solid var(--line); border-top-color: var(--accent); animation: spin .8s linear infinite; }
+@keyframes spin { to { transform: rotate(360deg); } }
+.pv-text, .pv-hex { margin: 0; padding: 12px 14px; width: 100%; font: 12.5px/1.5 var(--mono); white-space: pre-wrap; overflow-wrap: anywhere; color: var(--text); text-align: left; }
+.pv-hex { white-space: pre; overflow-x: auto; overflow-wrap: normal; font-size: 12px; }
+.pv-hex .o { color: var(--text-3); } .pv-hex .a { color: var(--accent); }
+.pv-page { width: 100%; background: var(--surface); padding: 18px 22px; font-family: Georgia, "Times New Roman", serif; font-size: 14px; line-height: 1.6; text-align: left; }
+.pv-page p { margin: 0 0 .8em; white-space: pre-wrap; } .pv-page h4 { margin: 1em 0 .4em; font-family: var(--font); font-size: 16px; }
+.pv-sheet { width: 100%; overflow: auto; text-align: left; }
+.pv-sheet table { border-collapse: collapse; font-size: 12.5px; min-width: 100%; }
+.pv-sheet th, .pv-sheet td { border: 1px solid var(--line); padding: 4px 8px; white-space: nowrap; max-width: 240px; overflow: hidden; text-overflow: ellipsis; }
+.pv-sheet th { background: var(--surface); color: var(--text-3); font-weight: 500; position: sticky; top: 0; }
+.pv-slide { width: calc(100% - 20px); margin: 10px; padding: 14px 16px; background: var(--surface); border-radius: 10px; box-shadow: 0 0 0 1px var(--line); text-align: left; }
+.pv-slide small { color: var(--text-3); } .pv-slide h4 { margin: 4px 0 6px; font-size: 16px; } .pv-slide p { margin: 0 0 4px; font-size: 13.5px; }
+.pv-zip { list-style: none; margin: 0; padding: 4px 0; width: 100%; text-align: left; font-size: 13px; }
+.pv-zip li { display: flex; justify-content: space-between; gap: 12px; padding: 5px 14px; border-bottom: 1px solid var(--line); }
+.pv-zip li span { overflow-wrap: anywhere; } .pv-zip small { color: var(--text-3); flex: none; }
+.pv-pdfbar { position: sticky; top: 0; z-index: 2; display: flex; gap: 10px; align-items: center; justify-content: center; padding: 6px; width: 100%; background: var(--side); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); }
+.pv-pdfbar .pg { font-size: 13px; color: var(--text-2); min-width: 110px; text-align: center; }
+.pv-pdfwrap { padding: 8px; } .pv-canvas { display: block; background: #fff; box-shadow: 0 2px 14px rgba(0, 0, 0, .25); }
+
+dialog.lightbox { width: min(1180px, 96vw); height: min(90vh, 920px); padding: 0; display: none; grid-template-rows: auto minmax(0, 1fr) auto; overflow: hidden; }
+dialog.lightbox[open] { display: grid; }
+.lb-head, .lb-foot { display: flex; gap: 12px; align-items: center; padding: 12px 16px; }
+.lb-head { border-bottom: 1px solid var(--line); } .lb-foot { border-top: 1px solid var(--line); flex-wrap: wrap; justify-content: space-between; }
+.lb-head .ttl { flex: 1; min-width: 0; } .lb-head .ttl b { display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; } .lb-head .ttl small { color: var(--text-2); }
+.lb-body { padding: 12px; min-height: 0; }
+
+.hero-logo { width: min(440px, 80%); height: auto; display: block; margin: 0 0 22px -4px; }
+.pill.accent { background: var(--accent-soft); color: var(--accent); }