top bar drag standardization: auto carve-out + the overlay DOM law (owner ruling)

The chains-overlay TopBar had dead drag zones (counts, around search,
close gap) — cause: app-region subtraction resolves by DOM ORDER, not
z-index; the graph chrome's lh-no-drag column came later in the DOM and
punched holes through the overlay's drag band despite sitting visually
underneath (z-40 vs z-10).

Two laws, per the owner's standardization ruling:
- AUTO CARVE-OUT (globals.css): inside any .lh-drag band, every native
  interactive element (button/input/textarea/select/a/summary/
  [contenteditable]) is automatically a no-drag island — draggable
  anywhere that is not a clickable element becomes structural. Manual
  lh-no-drag is only for clickable non-natives.
- THE OVERLAY DOM LAW: a surface containing a TopBar that covers other
  content must be the LAST child of its container — ChainTableOverlay
  moved after the chrome column (verified live: last child, after the
  column; auto-carve rule compiled; search/close/sidebar-toggle all
  still click).

app/globals.css

@@ -478,6 +478,9 @@ body {
                        resolves by DOM order, not z-index: no-drag subtracts
                        only regions added earlier in the tree)
    - .lh-no-drag     carve-out for interactive elements inside a drag band
+                       (native interactive elements carve out AUTOMATICALLY —
+                       see the auto carve-out rule below; manual use is for
+                       clickable non-natives only)
    - .lh-lights-gutter  the sidebar LH band's traffic-light gutter: lights
                        end at x≈68, the wordmark starts at 80px (5rem)
    - .lh-closed-toggle  same gutter for the sidebar toggle when the sidebar
@@ -489,6 +492,17 @@ body {
 .lh-electron .lh-no-drag {
 	-webkit-app-region: no-drag;
 }
+/* THE AUTO CARVE-OUT (owner standardization ruling, 2026-09-29 night):
+   inside a drag band, every NATIVE interactive element is automatically
+   a no-drag island — "draggable anywhere that is not a clickable
+   element" becomes structural, not per-child discipline. TopBar
+   contents can differ arbitrarily; buttons/inputs/links always stay
+   clickable with zero opt-out bookkeeping. Manual .lh-no-drag remains
+   only for clickable NON-native elements (spans/divs with onClick —
+   e.g. the graph chrome's control column). */
+.lh-electron .lh-drag :is(button, input, textarea, select, a, summary, [contenteditable]) {
+	-webkit-app-region: no-drag;
+}
 /* 92px = measured lights' right edge (~75pt) + the lights' own 16px
    inset from the window edge — comfortable, symmetric air (owner). */
 .lh-electron .lh-lights-gutter {

components/graph-view.tsx

@@ -1555,19 +1555,7 @@ export function GraphView() {
 				}}
 			/>
 
-			{/* The chain table overlay (chains-overlay plan, 2026-09-29):
+
-			    ABSOLUTE INSIDE the graph area (the session-overlay idiom —
-			    never a body portal) so the app chrome stays sharp and
-			    reachable; the overlay itself is read-only toward the graph
-			    and owns its selection + the custom practice dialog. */}
-			<ChainTableOverlay
-				open={chainsOpen && !isEmpty}
-				nodes={snapshot?.nodes ?? []}
-				edges={snapshot?.edges ?? []}
-				sessions={snapshot?.sessions ?? {}}
-				fileSources={snapshot?.fileSources ?? {}}
-				onClose={() => setChainsOpen(false)}
-			/>
 
 			{/* Legend + filters: search box and per-state toggle rows. */}
 			{/* Top-right controls — separate floating containers (owner,
@@ -1734,6 +1722,26 @@ export function GraphView() {
 					)}
 				</div>
 			)}
-		</div>
+			{/* The chain table overlay (chains-overlay plan, 2026-09-29):
+			    ABSOLUTE INSIDE the graph area (the session-overlay idiom —
+			    never a body portal) so the app chrome stays sharp and
+			    reachable; the overlay itself is read-only toward the graph
+			    and owns its selection + the custom practice dialog.
+			    LAST CHILD OF THE ROOT, DELIBERATELY (owner, 2026-09-29
+			    night): app-region subtraction resolves by DOM order, not
+			    z-index — mounted earlier, the chrome's lh-no-drag column
+			    punched dead zones through the overlay's TopBar drag band
+			    (over the counts, around the search field). A full-bleed
+			    surface covering a drag band must paint AFTER everything it
+			    covers. (DeleteNodeDialog is body-portaled — DOM-irrelevant
+			    here.) */}
+			<ChainTableOverlay
+				open={chainsOpen && !isEmpty}
+				nodes={snapshot?.nodes ?? []}
+				edges={snapshot?.edges ?? []}
+				sessions={snapshot?.sessions ?? {}}
+				fileSources={snapshot?.fileSources ?? {}}
+				onClose={() => setChainsOpen(false)}
+			/>		</div>
 	);
 }

components/top-bar.tsx

@@ -11,17 +11,28 @@
  *
  * Mechanics baked in (the chat-session bar's proven pattern):
  * - h-15 (60px) — matches the sidebar's wordmark band, one border line.
- * - lh-drag — the window-drag band; interactive children carve out with
+ * - lh-drag — the window-drag band. NATIVE interactive children
- *   lh-no-drag (the mask law: carve-outs must come later in the DOM).
+ *   (button/input/a/…) carve out AUTOMATICALLY via the globals.css auto
+ *   carve-out rule (owner standardization ruling, 2026-09-29 night) —
+ *   "draggable anywhere that is not a clickable element" is structural,
+ *   not per-child discipline; manual lh-no-drag is only for clickable
+ *   non-natives (spans/divs with onClick).
  * - select-none — dragging never highlights the title.
  * - SidebarToggle FIRST — the sidebar reopen when closed, with its
  *   Electron traffic-light gutter (lh-closed-toggle).
  * - border-b border-border px-3, gap-3 rhythm.
  *
  * The consumer brings the title (font-title text-3xl tracking-tight) and
- * any right-side controls (lh-no-drag on each). `drag={false}` is the one
+ * any right-side controls. `drag={false}` is the one escape hatch —
- * escape hatch — chat's rename mode (app-region:drag would eat the
+ * chat's rename mode (app-region:drag would eat the mousedown that
- * mousedown that exits the input; owner ask).
+ * exits the input; owner ask).
+ *
+ * THE OVERLAY TWIN OF THE MASK LAW (owner, 2026-09-29 night): app-region
+ * subtraction resolves by DOM order, not z-index — a surface containing
+ * a TopBar that COVERS other content (a full-bleed overlay) must be the
+ * LAST child of its container, or later no-drag elements punch dead
+ * zones through the bar (the chains-overlay bug: the graph chrome's
+ * no-drag column killed drag over the counts/search/close area).
  */
 
 import type { ReactNode } from "react";