feat(web): add persistent beam avatars

frontend/src/app/globals.css

@@ -345,6 +345,9 @@ button:disabled { cursor: default; opacity: .45; }
 .session-actions .session-action-danger[data-highlighted] { background: var(--color-danger-muted); }
 .sidebar-footer { position: relative; margin-top: 0; padding-top: 10px; border-top: 1px solid var(--sidebar-border); }
 .profile-trigger { width: 100%; display: grid; grid-template-columns: 34px minmax(0, 1fr) 18px; align-items: center; gap: 9px; padding: 5px 7px; border: 0; background: transparent; color: var(--sidebar-foreground); cursor: pointer; text-align: left; transition: background-color 120ms ease-out, transform 120ms ease-out; min-height: 56px; border-radius: var(--radius-md); }
+.user-avatar { display: inline-grid; flex: 0 0 auto; overflow: hidden; place-items: center; border-radius: 50%; background: var(--color-action-soft); }
+.user-avatar > svg { width: 100%; height: 100%; display: block; }
+.profile-avatar { width: 32px; height: 32px; }
 .profile-initial { width: 32px; height: 32px; display: grid; place-items: center; border-radius: 50%; font-size: 12px; text-transform: uppercase; border: 0; background: var(--color-action); color: var(--color-on-dark); font-weight: 500; }
 .profile-trigger b { display: block; overflow: hidden; line-height: 1.4; text-overflow: ellipsis; white-space: nowrap; font-size: 13px; font-weight: 500; }
 [data-sidebar="trigger"] { width: 44px; height: 44px; display: grid; flex: 0 0 auto; place-items: center; padding: 0; border: 0; border-radius: 50%; background: transparent; color: var(--sidebar-foreground); cursor: pointer; }
@@ -709,6 +712,7 @@ button:disabled { cursor: default; opacity: .45; }
 .account-menu-popup[data-starting-style], .account-menu-popup[data-ending-style] { opacity: 0; transform: translateY(var(--space-1)); }
 .account-menu-identity { min-width: 0; display: grid; grid-template-columns: 40px minmax(0, 1fr); align-items: center; gap: var(--space-3); margin-bottom: var(--space-1); padding: var(--space-3); border-radius: var(--radius-md); background: var(--color-canvas-muted); }
 .account-menu-avatar { width: 40px; height: 40px; display: grid; place-items: center; border-radius: 50%; background: var(--color-action); color: var(--color-on-dark); font-size: var(--type-caption); font-weight: 500; text-transform: uppercase; }
+.user-avatar.account-menu-avatar { overflow: hidden; }
 .account-menu-identity > span:last-child { min-width: 0; }
 .account-menu-identity b, .account-menu-identity small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
 .account-menu-identity b { color: var(--color-ink); font-size: var(--type-body-sm); font-weight: 500; }
@@ -732,6 +736,19 @@ button:disabled { cursor: default; opacity: .45; }
 .profile-modal { width: min(100%, 680px); scroll-padding-block-start: calc(var(--space-8) + 72px); }
 .profile-modal .account-modal-header { position: sticky; z-index: 1; top: 0; margin: calc(var(--space-8) * -1) calc(var(--space-8) * -1) var(--space-5); padding: var(--space-8) var(--space-8) var(--space-5); border-bottom: 1px solid var(--color-border); background: var(--color-canvas); }
 .profile-modal .birth-section { padding-top: var(--space-5); }
+.avatar-section { padding-top: 0; }
+.avatar-editor { display: grid; grid-template-columns: 96px minmax(0, 1fr); align-items: center; gap: var(--space-5); margin-top: var(--space-5); }
+.avatar-editor-controls { min-width: 0; display: grid; gap: var(--space-4); }
+.avatar-palette-list { display: grid; grid-template-columns: repeat(4, minmax(48px, 1fr)); gap: var(--space-2); }
+.avatar-palette { min-width: 0; height: 34px; overflow: hidden; display: flex; padding: 3px; border: 1px solid var(--color-border); border-radius: var(--radius-md); background: var(--color-canvas); cursor: pointer; transition: border-color 120ms ease-out, box-shadow 120ms ease-out, transform 120ms ease-out; }
+.avatar-palette > span { min-width: 0; flex: 1; }
+.avatar-palette > span:first-child { border-radius: calc(var(--radius-md) - 4px) 0 0 calc(var(--radius-md) - 4px); }
+.avatar-palette > span:last-child { border-radius: 0 calc(var(--radius-md) - 4px) calc(var(--radius-md) - 4px) 0; }
+.avatar-palette[aria-checked="true"] { border-color: var(--color-action); box-shadow: 0 0 0 2px var(--color-action-soft); }
+.avatar-palette:disabled { cursor: wait; opacity: .65; }
+.avatar-palette:not(:disabled):active { transform: scale(.96); }
+.avatar-randomize { justify-self: start; }
+.avatar-notice { margin-top: var(--space-4); }
 .redeem-modal { width: min(100%, 420px); }
 .logout-modal { width: min(100%, 400px); }
 .account-modal h2, .auth-panel h1, .admin-header h1 { font-family: var(--font-display); font-weight: 400; letter-spacing: -.5px; text-wrap: balance; }
@@ -866,6 +883,9 @@ input:disabled, select:disabled { color: var(--color-ink-tertiary); background:
   .composer-wrap { padding: var(--space-2) var(--space-3) max(var(--space-3), env(safe-area-inset-bottom)); }
   .account-modal { max-height: calc(100dvh - var(--space-8)); padding: var(--space-6); }
   .profile-modal .account-modal-header { margin: calc(var(--space-6) * -1) calc(var(--space-6) * -1) var(--space-4); padding: var(--space-6) var(--space-6) var(--space-4); }
+  .avatar-editor { grid-template-columns: 72px minmax(0, 1fr); gap: var(--space-4); }
+  .avatar-editor > .user-avatar { width: 72px !important; height: 72px !important; }
+  .avatar-palette-list { grid-template-columns: repeat(2, minmax(64px, 1fr)); }
   .auth-page { padding: 0; }
   .auth-shell { min-height: 100dvh; grid-template-columns: 1fr; grid-template-rows: auto 1fr; border-radius: 0; box-shadow: none; }
   .auth-story { min-height: 248px; padding: var(--space-8) var(--space-6); }