remove desktop help modal

frontend/src/styles/workspace/workspace-overlays.css

@@ -1,94 +0,0 @@
-/* Workspace overlays (help, guidance, etc.) */
-.desk-help-overlay {
-  position: fixed;
-  inset: 0;
-  z-index: 2000000;
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  padding: clamp(1.5rem, 4vw, 3rem);
-  pointer-events: none;
-}
-
-.desk-help-overlay__backdrop {
-  position: absolute;
-  inset: 0;
-  background: var(--surface-overlay);
-  backdrop-filter: blur(8px);
-  pointer-events: auto;
-}
-
-.desk-help-overlay__content {
-  position: relative;
-  width: min(640px, 92vw);
-  max-height: min(80vh, 640px);
-  background: var(--surface);
-  border: 1px solid var(--border);
-  box-shadow: 0 24px 64px var(--shadow-strong);
-  border-radius: 1.25rem;
-  display: flex;
-  flex-direction: column;
-  pointer-events: auto;
-  overflow: hidden;
-}
-
-.desk-help-overlay__header,
-.desk-help-overlay__footer {
-  display: flex;
-  align-items: center;
-  justify-content: space-between;
-  padding: 1rem 1.25rem;
-}
-
-.desk-help-overlay__header {
-  border-bottom: 1px solid var(--border);
-}
-
-.desk-help-overlay__header h2 {
-  margin: 0;
-  font-size: 1.15rem;
-  font-weight: 600;
-}
-
-.desk-help-overlay__body {
-  padding: 1rem 1.25rem 1.5rem;
-  overflow-y: auto;
-  display: flex;
-  flex-direction: column;
-  gap: 0.75rem;
-  line-height: 1.55;
-}
-
-.desk-help-overlay__body p {
-  margin: 0;
-  color: var(--muted);
-}
-
-.desk-help-overlay__list {
-  margin: 0;
-  padding-left: 1.1rem;
-  display: flex;
-  flex-direction: column;
-  gap: 0.5rem;
-}
-
-.desk-help-overlay__list li {
-  color: var(--fg);
-}
-
-.desk-help-overlay__body kbd {
-  display: inline-block;
-  padding: 0.15rem 0.4rem;
-  border-radius: 0.4rem;
-  border: 1px solid var(--border-strong);
-  background: var(--surface-subtle);
-  font-size: 0.85em;
-  line-height: 1;
-  font-family: inherit;
-}
-
-.desk-help-overlay__footer {
-  border-top: 1px solid var(--border);
-  justify-content: flex-end;
-  gap: 0.5rem;
-}