fix(ui): stop Firefox tab restore from switching theme to custom

Closes #11813

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

.ai/lessons.md

@@ -107,3 +107,6 @@
 ## Cached and stored state
 - `StandaloneDocker`/`SwarmDocker` `server` uses `Server::findCached()`, a per-process identity map that is flushed only when the `servers` row updates. A `ServerSetting` save does not flush it, so pass the current `Server` instance (`setRelation('server', $server)`) when generated output depends on just-saved settings.
 - Application deployments use the stored `custom_labels` when they exist. When a server-level setting changes the generated labels, regenerate the stored labels of read-only (`is_container_label_readonly_enabled`) applications, or a redeploy keeps the old labels.
+
+## Keep browser form restore away from app state
+- Firefox session restore writes saved input values back and fires a trusted `input` event. Add `autocomplete="off"` to inputs that only mirror client state (for example an Alpine-bound color picker), or their handlers run without a user action.

resources/views/components/theme-controls/picker.blade.php

@@ -19,7 +19,9 @@
     <label class="flex cursor-pointer items-center gap-2.5 rounded-lg border border-neutral-200 p-2 transition-colors hover:border-neutral-300 dark:border-white/[0.08] dark:hover:border-white/[0.14]">
         <span class="relative size-8 shrink-0 overflow-hidden rounded-md border border-black/10 shadow-sm dark:border-white/15">
             <span class="absolute inset-0" :style="`background: ${themeColor}`"></span>
-            <input type="color" :value="themeColor" @input="previewThemeColor($event.target.value)"
+            {{-- autocomplete="off": Firefox session restore otherwise replays this
+                 value with an input event and switches the theme to custom (#11813). --}}
+            <input type="color" autocomplete="off" :value="themeColor" @input="previewThemeColor($event.target.value)"
                 @change="saveThemeColor($event.target.value)" aria-label="Custom theme color"
                 class="absolute inset-0 h-full w-full cursor-pointer opacity-0" />
         </span>