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/examples.html

@@ -1,20 +1,20 @@
 <h3>Upload examples</h3>
 <h4>Basic CLI upload</h4>
-<pre>curl \
+<code class="code-block">curl \
   -F 'files=@./photo.png' \
   -F 'retention=24h' \
   {{ origin }}/upload
-</pre>
+</code>
 <h4>Multiple files with password</h4>
-<pre>curl \
+<code class="code-block">curl \
   -F 'files=@./one.png' \
   -F 'files=@./two.zip' \
   -F 'retention=1h' \
   -F 'password=secret-pass' \
   {{ origin }}/upload
-</pre>
+</code>
 <h4>Go</h4>
-<pre>package main
+<code class="code-block">package main
 
 import (
   "bytes"
@@ -48,9 +48,9 @@ func main() {
   out, _ := io.ReadAll(resp.Body)
   fmt.Println(string(out))
 }
-</pre>
+</code>
 <h4>Java 11+ HttpClient</h4>
-<pre>import java.net.URI;
+<code class="code-block">import java.net.URI;
 import java.net.http.HttpClient;
 import java.net.http.HttpRequest;
 import java.net.http.HttpResponse;
@@ -84,9 +84,9 @@ public class UploadWarpBox {
     System.out.println(response.body());
   }
 }
-</pre>
+</code>
 <h4>JavaScript Node.js</h4>
-<pre>import { openAsBlob } from 'node:fs';
+<code class="code-block">import { openAsBlob } from 'node:fs';
 
 const file = await openAsBlob('./photo.png');
 const form = new FormData();
@@ -99,4 +99,4 @@ const res = await fetch('{{ origin }}/upload', {
 });
 
 console.log(await res.text());
-</pre>
+</code>