feat: final production polish — light mode rebuild, lt.init(), cross-tab theme

Light mode — complete rebuild (section 51):
- Full token override for every surface, component, and state
- Desaturated accents: orange #c44e00, cyan #0062b8, green #006d35 etc.
- Glows replaced with subtle drop-shadow rings (no neon on white)
- Covers: toasts, modals, dropdowns, notification panel, context menu,
  right drawer, combobox, typeahead, wizard, timeline, pagination, tabs,
  badges, tables, code blocks, skeleton, avatar, sortable, markdown,
  scrollbars, buttons, nav drawer, WS status — nothing missed
- Dot-grid: neutral gray (was incorrect blue tint)
- Toast background uses var(--bg-overlay) instead of hardcoded dark rgba

Theme system improvements:
- _applyTheme now sets document.documentElement.style.colorScheme
- theme-color meta tag syncs on toggle (browser chrome follows theme)
- Cross-tab sync via storage event (toggle in one tab updates others)

lt.init() master initializer:
- Single call wires accordion, tooltip, alerts, clipboard, sidebar,
  submenus, and boot sequence
- Replaces 6+ individual .init() calls in user code
- demo HTML updated to use lt.init({ bootName: 'MY APP' })

Accessibility:
- Ticket table: add <caption class="lt-sr-only"> for WCAG compliance
- Table gets aria-label attribute

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

base.js

@@ -1462,7 +1462,11 @@
   const _themeKey = 'lt_theme';
   function _applyTheme(t) {
     document.documentElement.setAttribute('data-theme', t);
+    document.documentElement.style.colorScheme = t;
     try { localStorage.setItem(_themeKey, t); } catch(_) {}
+    // Sync theme-color meta for browser chrome
+    const metaTheme = document.querySelector('meta[name="theme-color"]');
+    if (metaTheme) metaTheme.setAttribute('content', t === 'light' ? '#edf0f5' : '#030508');
     document.querySelectorAll('.lt-theme-btn').forEach(btn => {
       btn.textContent = t === 'light' ? '◐' : '☀';
       btn.setAttribute('aria-label', t === 'light' ? 'Switch to dark mode' : 'Switch to light mode');
@@ -1480,6 +1484,10 @@
     let saved; try { saved = localStorage.getItem(_themeKey); } catch(_) {}
     if (!saved) _applyTheme(e.matches ? 'light' : 'dark');
   });
+  // Sync theme across tabs via storage event
+  window.addEventListener('storage', e => {
+    if (e.key === _themeKey && e.newValue) _applyTheme(e.newValue);
+  });
   const theme = {
     toggle: () => _applyTheme(document.documentElement.getAttribute('data-theme') === 'light' ? 'dark' : 'light'),
     set:    t  => _applyTheme(t),
@@ -2655,10 +2663,47 @@
     },
   };
 
+  /* ================================================================
+     MASTER INIT
+     lt.init(opts?)
+     Call once after DOM ready. Runs all standard auto-init modules.
+     Opts: { boot: bool, bootName: str, tooltip: bool, accordion: bool,
+             alerts: bool, clipboard: bool, sidebar: bool, submenus: bool }
+     Individual modules can still be called manually.
+     ================================================================ */
+  function ltInit(opts) {
+    const o = Object.assign({
+      boot:      true,
+      bootName:  null,
+      tooltip:   true,
+      accordion: true,
+      alerts:    true,
+      clipboard: true,
+      sidebar:   true,
+      submenus:  true,
+    }, opts || {});
+
+    if (o.accordion) accordion.init();
+    if (o.tooltip)   tooltip.init();
+    if (o.alerts)    alerts.init();
+    if (o.clipboard) initCopyButtons();
+    if (o.sidebar)   initSidebar();
+    if (o.submenus)  initSidebarSubmenus();
+    if (o.boot) {
+      const bootEl = document.getElementById('lt-boot');
+      if (bootEl) {
+        const name = o.bootName || bootEl.dataset.appName || document.title.split('—')[0].trim();
+        boot.run(name);
+      }
+    }
+  }
+
   /* ================================================================
      PUBLIC API
      ---------------------------------------------------------------- */
   global.lt = {
+    /* Master initializer */
+    init: ltInit,
     /* Core */
     escHtml,
     toast,