feat: nano-style footer bar, missing utility classes, CSS semantic vars

- layout_footer.php: add lt-footer with context-sensitive keyboard hint bar
  ([ ~ ] HOME | [ / ] SEARCH | [ + ] NEW | [ * ] CFG | [ ? ] HELP)
  Context adapts for dashboard, ticket, and admin pages
- layout_footer.php: wire show-keyboard-help and open-settings for all pages
- base.css: body { display:flex; flex-direction:column } + lt-main { flex:1 }
  so footer sticks to bottom of viewport on short pages
- base.css: add lt-flex-gap-xs/sm/md/lg and lt-flex-align-start/center/end
  (were used across all views but never defined — causing broken layouts)
- base.css: add --lt-danger/amber/cyan/success/text-primary CSS variables
  (referenced in ticket.css and dashboard.css fallbacks but never declared)
- base.css: add lt-text-danger/warning/success/info/primary utility classes
  (used in TicketView, DashboardView, admin views but not defined in base.css)
- DashboardView.php: remove ascii-banner.js (loaded but never called)
- TemplatesView.php: fix priority badge from lt-p* to lt-chip component

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

assets/css/base.css

@@ -79,6 +79,13 @@
   --accent-purple:     #BF5FFF;
   --accent-purple-dim: rgba(191,95,255,0.10);
 
+  /* ── App semantic aliases (used in ticket.css, dashboard.css) ── */
+  --lt-danger:      var(--accent-red);
+  --lt-amber:       var(--accent-amber);
+  --lt-cyan:        var(--accent-cyan);
+  --lt-success:     var(--accent-green);
+  --lt-text-primary: var(--accent-green);
+
   /* Legacy aliases — keeps all existing component HTML working */
   --terminal-green:       var(--accent-green);
   --terminal-green-dim:   var(--accent-green-dim);
@@ -216,6 +223,8 @@ body {
   min-height: 100vh;
   overflow-x: hidden;
   position: relative;
+  display: flex;
+  flex-direction: column;
 }
 
 a {
@@ -349,6 +358,7 @@ hr {
 
 .lt-main {
   padding-top: calc(var(--header-height) + var(--space-lg));
+  flex: 1;
 }
 
 .lt-layout {
@@ -369,6 +379,17 @@ hr {
 .lt-flex-col     { display: flex; flex-direction: column; }
 .lt-flex-wrap    { flex-wrap: wrap; }
 
+/* Flex gap modifiers (used with lt-flex) */
+.lt-flex-gap-xs  { gap: var(--space-xs); }
+.lt-flex-gap-sm  { gap: var(--space-sm); }
+.lt-flex-gap-md  { gap: var(--space-md); }
+.lt-flex-gap-lg  { gap: var(--space-lg); }
+
+/* Flex align modifiers */
+.lt-flex-align-start  { align-items: flex-start; }
+.lt-flex-align-center { align-items: center; }
+.lt-flex-align-end    { align-items: flex-end; }
+
 .lt-gap-sm { gap: var(--space-sm); }
 .lt-gap-md { gap: var(--space-md); }
 .lt-gap-lg { gap: var(--space-lg); }
@@ -2294,6 +2315,12 @@ select option:checked {
 .lt-text-red     { color: var(--accent-red);    text-shadow: var(--glow-red); }
 .lt-text-muted   { color: var(--text-muted); }
 .lt-text-dim     { color: var(--text-dim); }
+/* Semantic aliases */
+.lt-text-danger  { color: var(--accent-red);    text-shadow: var(--glow-red); }
+.lt-text-warning { color: var(--accent-amber);  text-shadow: var(--glow-amber); }
+.lt-text-success { color: var(--accent-green);  text-shadow: var(--glow-green); }
+.lt-text-info    { color: var(--accent-cyan);   text-shadow: var(--glow-cyan); }
+.lt-text-primary { color: var(--accent-green);  text-shadow: var(--glow-green); }
 
 .lt-text-xs  { font-size: 0.63rem; }
 .lt-text-sm  { font-size: 0.78rem; }
@@ -5477,7 +5504,7 @@ body.lt-is-offline .lt-main { margin-top: 2rem; transition: margin-top 0.25s eas
   align-items: center;
   flex-wrap: wrap;
   gap: var(--space-sm);
-  padding: var(--space-md) var(--space-lg);
+  padding: var(--space-sm) var(--space-lg);
   border-top: 1px solid var(--border-dim);
   margin-top: auto;
   background: var(--bg-secondary);
@@ -5485,6 +5512,49 @@ body.lt-is-offline .lt-main { margin-top: 2rem; transition: margin-top 0.25s eas
   font-size: 0.7rem;
   font-family: var(--font-mono);
 }
+
+/* Keyboard hint bar */
+.lt-footer-hints {
+  display: flex;
+  gap: 0.75rem;
+  align-items: center;
+  flex-wrap: wrap;
+}
+.lt-footer-hint {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.25rem;
+  color: var(--text-muted);
+  font-size: 0.68rem;
+  letter-spacing: 0.03em;
+  text-decoration: none;
+  background: none;
+  border: none;
+  padding: 0;
+  font-family: inherit;
+  cursor: default;
+  transition: color 0.12s;
+}
+a.lt-footer-hint,
+button.lt-footer-hint {
+  cursor: pointer;
+}
+a.lt-footer-hint:hover,
+button.lt-footer-hint:hover {
+  color: var(--accent-green);
+  text-shadow: var(--glow-green);
+}
+.lt-footer-key {
+  color: var(--accent-green);
+  opacity: 0.75;
+  font-weight: 700;
+}
+.lt-footer-sep {
+  opacity: 0.25;
+  user-select: none;
+}
+
 @media (max-width: 479px) {
   .lt-footer { flex-direction: column; align-items: flex-start; gap: 0.25rem; }
+  .lt-footer-hints { gap: 0.5rem; }
 }