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/ProjectView.vue

@@ -1203,10 +1203,7 @@ async function confirmDelete() {
 /* ── Layout ─────────────────────────────────────────────────── */
 /* ── Nav bar ─────────────────────────────────────────────────── */
 .page-header {
-  display: flex;
-  justify-content: space-between;
-  align-items: center;
-  margin-bottom: 1.5rem;
+  margin-bottom: 1.5rem;   /* roomier than the shared recipe */
 }
 .page-header-actions { display: flex; gap: 0.5rem; align-items: center; }
 .plan-title-input {
@@ -1816,7 +1813,7 @@ async function confirmDelete() {
 .note-title { font-weight: 500; min-width: 0; flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
 .note-date { font-size: 0.75rem; color: var(--fs-text-tertiary); flex-shrink: 0; }
 
-.empty-msg { color: var(--fs-text-tertiary); font-size: 0.875rem; text-align: center; padding: 1rem; }
+.empty-msg { text-align: center; padding: 1rem; }   /* remainder over the shared recipe */
 /* Deliberately NOT styled like .empty-msg: "no tasks" and "the tasks did not
    load" look identical to a user, and conflating them is what let a silent
    failure read as an empty project. */