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/popups/cli.html

@@ -1,9 +1,33 @@
 <h3>Upload with cURL</h3>
 <p>WarpBox accepts normal multipart form uploads through the compatibility endpoint:</p>
-<pre>curl \
+<code class="code-block">curl \
   -F 'files=@./my-file.zip' \
   -F 'retention=1h' \
   {{ origin }}/upload
-</pre>
+</code>
 <h4>Browser flow</h4>
 <p>The browser uses the manifest API: it creates a box, uploads each file, and marks failed uploads so the download page does not wait forever.</p>
+<h4>Make a WarpBox executable</h4>
+<p>Save this as <code>warpbox</code>, make it executable, and put it somewhere on your <code>PATH</code>.</p>
+<code class="code-block">#!/usr/bin/env bash
+set -euo pipefail
+
+if [ "$#" -lt 1 ]; then
+  echo "Usage: warpbox FILE [FILE ...]" >&amp;2
+  exit 64
+fi
+
+endpoint="${WARPBOX_URL:-{{ origin }}}/upload"
+retention="${WARPBOX_RETENTION:-1h}"
+
+args=(-F "retention=${retention}")
+for file in "$@"; do
+  args+=(-F "files=@${file}")
+done
+
+curl "${args[@]}" "${endpoint}"
+</code>
+<code class="code-block">chmod +x ./warpbox
+sudo install -m 755 ./warpbox /usr/local/bin/warpbox
+warpbox ./my-file.zip
+</code>