fix(maestro): restore sidebar footer, fix spawn modal and session card regressions

Post-React-migration regressions: spawn submit button moved to modal
footer, sidebar footer restored (help/theme/palette/status/spawn),
session card stripped of redundant Tailwind, action buttons use proper
leaf-act/leaf-actions CSS structure for hover-only visibility.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/components/spawn/SpawnForm.tsx

@@ -104,9 +104,11 @@ export interface SpawnFormProps {
   /** Fired whenever any value changes, once the form's initial seed settles. */
   onChange?(values: SpawnFormValues): void;
   onSuccess(session: Session): void;
+  /** When true, hides the built-in submit button (the modal provides its own). */
+  externalSubmit?: boolean;
 }
 
-export function SpawnForm({ seed, onChange, onSuccess }: SpawnFormProps) {
+export function SpawnForm({ seed, onChange, onSuccess, externalSubmit }: SpawnFormProps) {
   const prefill = useRef(seed ?? {}).current;
 
   const formRef = useRef<HTMLFormElement>(null);
@@ -240,7 +242,7 @@ export function SpawnForm({ seed, onChange, onSuccess }: SpawnFormProps) {
 
   const [advancedCollapsed, setAdvancedCollapsed] = useState(true);
   const [error, setError] = useState("");
-  const [submitting, setSubmitting] = useState(false);
+  const [, setSubmitting] = useState(false);
   const [ready, setReady] = useState(false);
 
   const probeTokenRef = useRef(0);
@@ -620,6 +622,7 @@ export function SpawnForm({ seed, onChange, onSuccess }: SpawnFormProps) {
 
   return (
     <form
+      id="spawn-form"
       ref={formRef}
       onSubmit={onSubmit}
       onKeyDown={onFormKeyDown}
@@ -839,15 +842,16 @@ export function SpawnForm({ seed, onChange, onSuccess }: SpawnFormProps) {
       <p role="alert" aria-live="polite" className={`m-0 text-fs-13 text-danger ${error ? "rounded-r-2 bg-danger-tint px-sp-3 py-sp-2" : "min-h-[1.2em]"}`}>
         {error}
       </p>
-      <div className="flex justify-end">
-        <button
-          type="submit"
-          disabled={submitting}
-          className="rounded-r-1 bg-accent px-sp-4 py-sp-2 text-fs-13 font-semibold text-accent-ink disabled:opacity-60"
-        >
-          Spawn
-        </button>
-      </div>
+      {!externalSubmit && (
+        <div className="flex justify-end">
+          <button
+            type="submit"
+            className="btn btn-primary rounded-r-1 px-sp-4 py-sp-1 text-fs-13 font-semibold"
+          >
+            Spawn
+          </button>
+        </div>
+      )}
     </form>
   );
 }

web/src/components/spawn/SpawnModal.tsx

@@ -64,16 +64,23 @@ export function SpawnModal({ seed, onSuccess, onClose }: SpawnModalProps) {
           </button>
         </header>
         <div ref={filterInputRef} className="min-h-0 flex-1 overflow-auto">
-          <SpawnForm seed={seed} onSuccess={handleSuccess} />
+          <SpawnForm seed={seed} onSuccess={handleSuccess} externalSubmit />
         </div>
         <div className="flex justify-end gap-sp-2 border-t border-border p-sp-3">
           <button
             type="button"
-            className="rounded-r-1 border border-border px-sp-3 py-sp-1 text-fs-12 text-ink"
+            className="rounded-r-1 border border-border px-sp-3 py-sp-1 text-fs-13 text-ink"
             onClick={onClose}
           >
             Cancel
           </button>
+          <button
+            type="submit"
+            form="spawn-form"
+            className="btn btn-primary rounded-r-1 px-sp-4 py-sp-1 text-fs-13 font-semibold"
+          >
+            Spawn
+          </button>
         </div>
       </div>
     </div>,