feat(isac): support deferred item icons

src/app.css

@@ -196,4 +196,5 @@
 .weapon-mod-exotic-quality{min-height:58px;display:flex;align-items:center;gap:8px;padding:7px;border:1px solid #74552a;border-left:2px solid var(--quality-high-end);background:#18150d}.weapon-mod-exotic-quality .game-icon{width:34px;height:34px}.weapon-mod-exotic-quality span{display:grid;gap:3px}.weapon-mod-exotic-quality b{color:var(--quality-high-end);font-size:7px;letter-spacing:.8px}.weapon-mod-exotic-quality small{color:#a89568;font-size:5px;letter-spacing:.35px}
 .weapon-mod-exotic-toggle>span{width:44px;min-height:42px;padding:0}.weapon-mod-exotic-toggle input{position:absolute;width:1px;height:1px;margin:0;opacity:0;pointer-events:none}.weapon-mod-exotic-toggle .game-icon{width:30px;height:30px}.weapon-mod-compatibility .segmented-choice>div{height:48px}.weapon-mod-compatibility .segmented-choice .game-icon{width:34px;height:34px}.weapon-mod-exotic-section{margin-top:10px;padding:9px;border:1px solid #74552a;border-left:2px solid var(--quality-high-end);background:#0d1011}.weapon-mod-exotic-attributes{display:grid;gap:6px;margin-top:7px}.weapon-mod-exotic-attributes>div{display:grid;grid-template-columns:30px minmax(240px,1fr) 150px 150px 30px;align-items:end;gap:6px;padding:6px;border:1px solid var(--shd-border);background:#101314}.weapon-mod-exotic-attributes>div>strong{height:100%;display:grid;place-items:center;background:#171b1c;color:var(--quality-high-end);font-size:8px}.weapon-mod-exotic-attributes label{display:grid;gap:4px;color:var(--shd-text-muted);font-size:5px;font-weight:900;letter-spacing:.5px}.weapon-mod-exotic-attributes input{height:32px;margin:0;padding:0 6px}.weapon-mod-exotic-attributes>div>button{height:32px;border:1px solid #563734;background:#1d1212;color:var(--shd-danger);cursor:pointer}.weapon-mod-exotic-attributes>div>button:disabled{opacity:.3;cursor:not-allowed}@media(max-width:700px){.weapon-mod-exotic-attributes>div{grid-template-columns:30px 1fr}.weapon-mod-exotic-attributes label,.weapon-mod-exotic-attributes>div>button{grid-column:2}.weapon-mod-compatibility .segmented-choice>div{height:auto;grid-template-columns:repeat(3,1fr)}.weapon-mod-compatibility .segmented-choice span{min-height:50px}}
 .gear-mod-identity{display:grid;grid-template-columns:minmax(320px,1fr) minmax(560px,1.5fr);align-items:end;gap:8px}.gear-mod-identity>.field{margin:0}.gear-mod-primary-types>div{flex-wrap:wrap}.gear-mod-row{min-width:1120px;grid-template-columns:1.2fr 1fr .9fr 1fr .55fr .55fr .3fr}.gear-mod-row>span{display:flex;align-items:center;gap:6px}.gear-mod-row>span small{color:var(--shd-text-muted)}@media(max-width:900px){.gear-mod-identity{grid-template-columns:1fr}}@media(max-width:700px){.gear-mod-primary-types>div{display:grid;grid-template-columns:1fr 1fr}}
+.missing-item-icon{opacity:.7;filter:saturate(.75)}.icon-upload-preview .missing-item-icon{width:66px;height:66px;opacity:.62}.registry-icon-identity>.missing-item-icon,.registry-icon-rail .missing-item-icon{padding:2px;border:1px dashed #424849;background:#101314}.builder-picker .missing-item-icon,.builder-radio-grid .missing-item-icon{opacity:.66}