v0.7.1: in-app password change, custom labels, always-on folders

- Settings -> Account: change your own password (current + new), session
  preserved via update_session_auth_hash.
- Custom labels: per-user palette in Settings -> Labels; apply/remove from a
  message's ... menu (menu stays open, checkmark = applied). Labels are unified
  with tags; chip colours sync to the global TagColor. New Label model +
  migration 0017; POST /a/{id}/label (session, owner-scoped, palette-validated).
- Sidebar Keep/Deleted folders are now always shown; count badge only when
  non-empty. Updates the stale 'hide when empty' note in CLAUDE.md.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

static/agentfeed.css

@@ -1144,6 +1144,48 @@ kbd {
   color: var(--danger-text-plain);
 }
 
+.row-menu-divider {
+  border-top: 1px solid var(--grid-line);
+  margin: 0.25rem 0;
+}
+
+.row-menu-labels {
+  display: flex;
+  flex-direction: column;
+  max-height: 13rem;
+  overflow-y: auto;
+}
+
+.row-menu-label {
+  align-items: center;
+  display: flex;
+  gap: 0.45rem;
+}
+
+.row-menu-dot {
+  border-radius: 50%;
+  flex: 0 0 auto;
+  height: 0.7rem;
+  width: 0.7rem;
+}
+
+.row-menu-label-name {
+  flex: 1 1 auto;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+/* Checkmark only visible once the label is applied to the row. */
+.row-menu-check {
+  flex: 0 0 auto;
+  opacity: 0;
+}
+
+.row-menu-label.applied .row-menu-check {
+  opacity: 1;
+}
+
 /* System folders (Keep / Deleted): pinned at the bottom of the sidebar,
    below the scrolling source list. */
 .system-folders {
@@ -1198,6 +1240,32 @@ kbd {
   gap: 0.3rem;
 }
 
+.password-change {
+  display: flex;
+  flex-direction: column;
+  gap: 0.85rem;
+  max-width: 22rem;
+}
+
+.password-change .form-field {
+  display: flex;
+  flex-direction: column;
+  font-weight: 600;
+  gap: 0.3rem;
+}
+
+.password-change button {
+  align-self: start;
+}
+
+.form-errors {
+  color: var(--danger, #d1453b);
+  font-weight: 400;
+  list-style: none;
+  margin: 0.15rem 0 0;
+  padding: 0;
+}
+
 .api-key-table {
   border-collapse: collapse;
   width: 100%;