feat(v0.3): M3 themes/font settings + M7 session dashboard

- M3: settings.ts (⚙ panel: dark/light/solarized theme + font size A-/A+),
  persisted to localStorage; terminal-session.applyTheme; TabApp.applySettings
  applies to all + new tabs
- M7: dashboard.ts (▦ overlay listing every tab with connection dot + folder +
  Claude status; click a row to focus; live re-render while open);
  TabApp.snapshot()/focusTab()
- Browser-verified: light theme renders + persists; dashboard lists tabs and
  focuses on click. 208 tests green, typechecks + build ok.

public/style.css

@@ -153,6 +153,106 @@ html, body {
   font: inherit;
 }
 
+/* Settings panel (M3) */
+#settingspanel {
+  position: fixed;
+  top: calc(var(--tabbar-h) + 6px);
+  right: 8px;
+  z-index: 1100;
+  background: #2a2a2a;
+  border: 1px solid #3a3a3a;
+  border-radius: 6px;
+  padding: 10px;
+  min-width: 210px;
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
+  color: #ddd;
+}
+.settings-row {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  margin: 6px 0;
+}
+.settings-label {
+  width: 48px;
+  color: #aaa;
+  font-size: 13px;
+}
+.settings-opt {
+  background: #333;
+  border: 1px solid #444;
+  color: #ddd;
+  border-radius: 4px;
+  padding: 4px 9px;
+  cursor: pointer;
+  font: inherit;
+  font-size: 12px;
+}
+.settings-opt.active {
+  background: #4a9eff;
+  color: #fff;
+  border-color: #4a9eff;
+}
+.settings-size {
+  min-width: 22px;
+  text-align: center;
+}
+
+/* Dashboard (M7) */
+#dashboard {
+  position: fixed;
+  inset: 0;
+  z-index: 1200;
+  display: flex;
+  align-items: flex-start;
+  justify-content: center;
+  padding-top: 56px;
+  background: rgba(0, 0, 0, 0.6);
+}
+.dash-card {
+  background: #222;
+  border: 1px solid #3a3a3a;
+  border-radius: 10px;
+  min-width: 320px;
+  max-width: 90vw;
+  max-height: 70vh;
+  overflow-y: auto;
+  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
+}
+.dash-title {
+  padding: 12px 16px;
+  font-weight: 600;
+  color: #fff;
+  border-bottom: 1px solid #3a3a3a;
+}
+.dash-row {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  padding: 10px 16px;
+  cursor: pointer;
+  color: #ddd;
+  border-bottom: 1px solid #2a2a2a;
+}
+.dash-row:hover {
+  background: #2a2a2a;
+}
+.dash-row.active {
+  background: #1a1a1a;
+  box-shadow: inset 3px 0 0 #4a9eff;
+}
+.dash-name {
+  flex: 1;
+}
+.dash-claude {
+  color: #aaa;
+  font-size: 13px;
+}
+.dash-claude.pending {
+  color: #ffcf8f;
+  font-weight: 600;
+}
+
 .tab {
   display: flex;
   align-items: center;