refactor(frontend): the pay-down edits the first script dropped after its assertion stop — SharedWithMe/ProjectView page-header+empty-msg remainders, DesignSystems/Settings field-hint+.input trims, pane form-buttons deletions (milestone 302 step 4)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/views/SharedWithMeView.vue

@@ -98,7 +98,7 @@ onMounted(async () => {
 }
 
 .page-header {
-  margin-bottom: 2rem;
+  margin-bottom: 2rem;   /* roomier than the shared recipe */
 }
 
 .page-title {
@@ -247,8 +247,6 @@ onMounted(async () => {
 .perm-admin   { background: color-mix(in srgb, var(--fs-warning) 15%, transparent); color: var(--fs-warning); }
 
 .empty-msg {
-  color: var(--fs-text-tertiary);
-  font-size: 0.88rem;
   margin: 0;
   padding: 1rem 0;
 }