feat(ui): add clear queue flow and expose ISO expiry

- Add `formatBrowserTime()` and include ISO-8601 `expires_at` in box status JSON and `ExpiresAtISO` in the box view for browser-friendly rendering.
- Refresh UI styling (switch to MonoCraft/PixelOperatorMono, tweak base font size) and treat `aria-disabled="true"` like `disabled` for consistent button states.
- Introduce a clear-queue action with confirmation to reset upload state, unlock controls, and provide user feedback.feat(ui): add clear queue flow and expose ISO expiry

- Add `formatBrowserTime()` and include ISO-8601 `expires_at` in box status JSON and `ExpiresAtISO` in the box view for browser-friendly rendering.
- Refresh UI styling (switch to MonoCraft/PixelOperatorMono, tweak base font size) and treat `aria-disabled="true"` like `disabled` for consistent button states.
- Introduce a clear-queue action with confirmation to reset upload state, unlock controls, and provide user feedback.

static/css/box.css

@@ -1,52 +1,48 @@
 .box-window {
-    width: min(760px, calc(100vw - 36px));
+    width: min(860px, calc(100vw - 36px));
     height: min(560px, calc(100vh - 36px));
     zoom: var(--ui-scale);
 }
 
-.box-toolbar {
-    display: flex;
+body.fit-window .box-window {
+    width: min(980px, calc(100vw / var(--ui-scale) - 20px));
+    height: min(720px, calc(100vh / var(--ui-scale) - 20px));
+}
+
+.box-command-row {
+    display: grid;
+    grid-template-columns: minmax(0, 1fr) auto auto;
+    align-items: center;
     gap: 8px;
-    height: 40px;
+    min-height: 40px;
     padding: 6px 8px;
 }
 
 .box-toolbar-button {
-    width: 116px;
+    width: auto;
+    min-width: 158px;
+    display: inline-flex;
+    gap: 6px;
+    align-items: center;
+    justify-content: center;
+    white-space: nowrap;
+}
+
+.box-toolbar-button img {
+    width: 16px;
+    height: 16px;
+    image-rendering: pixelated;
 }
 
 .box-address {
-    display: grid;
-    grid-template-columns: 58px minmax(0, 1fr);
-    align-items: center;
-    height: 28px;
-    padding: 0 8px 6px;
-    gap: 6px;
-    font-size: 13px;
-    line-height: 13px;
-}
-
-.box-meta {
-    display: grid;
-    grid-template-columns: 58px minmax(0, 1fr);
-    align-items: center;
-    height: 24px;
-    padding: 0 8px 6px;
-    gap: 6px;
-    color: #333333;
-    font-size: 12px;
-    line-height: 12px;
-}
-
-.box-address code {
+    grid-column: 1;
     min-width: 0;
-    height: 22px;
+    width: 100%;
+    height: 24px;
     display: flex;
     align-items: center;
     padding: 0 6px;
     overflow: hidden;
-    text-overflow: ellipsis;
-    white-space: nowrap;
     color: #000000;
     background: #ffffff;
     border-top: 1px solid #808080;
@@ -54,6 +50,33 @@
     border-right: 1px solid #dfdfdf;
     border-bottom: 1px solid #dfdfdf;
     font-family: inherit;
+    font-size: 13px;
+    line-height: 13px;
+    text-align: left;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+}
+
+.win98-window.popup-window {
+    display: none;
+}
+
+.win98-window.popup-window.is-visible {
+    display: flex;
+}
+
+.box-meta {
+    min-height: 24px;
+    padding: 0 8px 6px;
+    color: #333333;
+    font-size: 12px;
+    line-height: 12px;
+}
+
+.box-meta span {
+    display: flex;
+    align-items: center;
+    min-height: 18px;
 }
 
 .box-panel {
@@ -169,6 +192,98 @@
     color: #ffffff;
 }
 
+.box-context-menu {
+    position: fixed;
+    min-width: 168px;
+    display: none;
+    padding: 2px;
+    background: var(--w98-gray);
+    border-top: 2px solid #ffffff;
+    border-left: 2px solid #ffffff;
+    border-right: 2px solid #000000;
+    border-bottom: 2px solid #000000;
+    box-shadow: 3px 3px 0 rgba(0,0,0,.35);
+    z-index: 95;
+}
+
+.box-context-menu.is-visible {
+    display: block;
+}
+
+.box-context-menu button {
+    width: 100%;
+    min-height: 24px;
+    display: grid;
+    grid-template-columns: 20px minmax(0, 1fr);
+    gap: 8px;
+    align-items: center;
+    padding: 2px 7px;
+    color: #000000;
+    background: transparent;
+    border: 0;
+    font-family: inherit;
+    font-size: 12px;
+    line-height: 13px;
+    text-align: left;
+}
+
+.box-context-menu button:hover,
+.box-context-menu button:focus-visible {
+    color: #ffffff;
+    background: #000078;
+    outline: none;
+}
+
+.box-context-menu img {
+    width: 16px;
+    height: 16px;
+    object-fit: contain;
+    image-rendering: pixelated;
+}
+
+.properties-grid {
+    display: grid;
+    grid-template-columns: 92px minmax(0, 1fr);
+    gap: 7px 10px;
+    padding: 10px;
+    background: #dfdfdf;
+    border-top: 1px solid #808080;
+    border-left: 1px solid #808080;
+    border-right: 1px solid #ffffff;
+    border-bottom: 1px solid #ffffff;
+}
+
+.properties-grid dt {
+    font-weight: bold;
+}
+
+.properties-grid dd {
+    min-width: 0;
+    margin: 0;
+    overflow-wrap: anywhere;
+}
+
+.preview-frame {
+    width: min(680px, 100%);
+    min-height: 260px;
+    max-height: min(520px, calc(100vh - 160px));
+    display: block;
+    margin: 0 auto;
+    background: #000000;
+    border: 1px solid #808080;
+}
+
+.preview-frame.is-text {
+    min-height: 240px;
+    padding: 10px;
+    overflow: auto;
+    color: #00ff66;
+    font-family: 'MonoCraft', 'PixelOperatorMono', 'Courier New', monospace;
+    font-size: 12px;
+    line-height: 15px;
+    white-space: pre;
+}
+
 .box-empty {
     margin: 0;
     padding: 12px;
@@ -205,6 +320,15 @@
         height: 26px;
     }
 
+    .box-command-row {
+        grid-template-columns: 1fr 1fr;
+    }
+
+    .box-address {
+        grid-column: 1 / -1;
+        grid-row: 1;
+    }
+
     .box-panel {
         margin: 0 6px 8px;
     }