feat(member): make overview columns sortable through accessible sort headers

assets/js/app.js

@@ -336,6 +336,72 @@ Hooks.SortableList = {
   }
 }
 
+// SortTooltip hook: shows the sort-header hint in the browser TOP LAYER via the
+// native Popover API, so it escapes the members table's overflow clipping
+// (overflow-x:auto forces overflow-y:auto, which clips a CSS tooltip below the
+// header) and paints above the sticky header, neighbor cells, and the pinned
+// checkbox column's fade — no z-index fight. The popover is shown on hover AND
+// keyboard focus and positioned next to the header with getBoundingClientRect
+// (portable; CSS anchor-positioning is not yet supported in Safari/Firefox).
+Hooks.SortTooltip = {
+  mounted() {
+    this.tip = document.getElementById(this.el.dataset.tooltipId)
+    // Feature-detect: without Popover API support fall back to no visual tooltip
+    // (the button's aria-label still conveys the hint to assistive tech).
+    if (!this.tip || typeof this.tip.showPopover !== "function") return
+
+    this.position = () => {
+      const btn = this.el.getBoundingClientRect()
+      const tip = this.tip.getBoundingClientRect()
+      const gap = 6
+      // Prefer just below the header; flip above when there is no room below.
+      let top = btn.bottom + gap
+      if (top + tip.height > window.innerHeight && btn.top - gap - tip.height >= 0) {
+        top = btn.top - gap - tip.height
+      }
+      // Left-align to the header, but keep the whole bubble on-screen.
+      let left = btn.left
+      const maxLeft = window.innerWidth - tip.width - gap
+      if (left > maxLeft) left = maxLeft
+      if (left < gap) left = gap
+      this.tip.style.top = `${Math.round(top)}px`
+      this.tip.style.left = `${Math.round(left)}px`
+    }
+
+    this.show = () => {
+      try {
+        if (!this.tip.matches(":popover-open")) this.tip.showPopover()
+        // showPopover() makes it measurable; positioning in the same tick avoids
+        // a visible flash (JS runs before the browser paints).
+        this.position()
+      } catch (_e) {}
+    }
+
+    this.hide = () => {
+      try {
+        if (this.tip.matches(":popover-open")) this.tip.hidePopover()
+      } catch (_e) {}
+    }
+
+    this.onKey = (e) => { if (e.key === "Escape") this.hide() }
+
+    this.el.addEventListener("mouseenter", this.show)
+    this.el.addEventListener("focus", this.show)
+    this.el.addEventListener("mouseleave", this.hide)
+    this.el.addEventListener("blur", this.hide)
+    this.el.addEventListener("keydown", this.onKey)
+  },
+
+  destroyed() {
+    if (this.hide) this.hide()
+    this.el.removeEventListener("mouseenter", this.show)
+    this.el.removeEventListener("focus", this.show)
+    this.el.removeEventListener("mouseleave", this.hide)
+    this.el.removeEventListener("blur", this.hide)
+    this.el.removeEventListener("keydown", this.onKey)
+  }
+}
+
 // SidebarState hook: Manages sidebar expanded/collapsed state
 Hooks.SidebarState = {
   mounted() {