feat(filter-builder): the group header is the ALL/ANY switch

The group header ("MATCH"/"GROUP") was a dead label while the engine
honored group modes all along — buildGroupClause parenthesizes nested
groups and joins each by its own mode, and validation accepted
all/any from day one. The only thing missing was the UI: + Group
birthed ALL groups and no control anywhere could flip one, so the
user's target structures (GROUP(GROUP(... or ...) ...) — 3-level
mixed-mode nesting) were constructible only through the invisible
row-level chips, and standalone ANY-groups not at all (2026-11-01
user report: "MATCH cannot be clicked").

- The header is now the control: MATCH ALL ⇄ MATCH ANY (root — a
  synthetic header row, since the root was never projected and its
  mode was invisible too), GROUP ALL ⇄ GROUP ANY (nested). ANY is
  accented; aria-pressed carries the state. Labels are path-based
  (root reads Match, explicit groups read Group) instead of
  depth-based, which previously mislabeled top-level groups.
- The row-level chips are untouched — they mix AND/OR inside a group
  (A AND (B OR C)), which a global mode toggle cannot express; the
  header is the discoverable entry point, the chips the refinement.
- Dropdown audit (the "would it bug out" check): suggestTree is
  mode-generic — root-ANY drops group siblings, sibling ANY-groups
  survive into the constraint with their mode intact, empty groups
  never emit (no 400s) — now pinned. Deep-nesting Go pin: a 3-level
  mixed-mode tree evaluated through composed search + the suggestion
  endpoint (200, never the empty-group 400). 192 web tests green.

cmd/server/tests/filter_builder_test.go

@@ -903,3 +903,85 @@ func TestFilterFlatEquivalence(t *testing.T) {
 	require.Equal(t, statusFlat, statusTree, "same result status")
 	assert.ElementsMatch(t, qfTitles(t, flatRows), qfTitles(t, treeRows))
 }
+
+// ---- deep group nesting (2026-11-01 group ALL/ANY header toggle): ----
+// the UI can now produce 3+-level mixed-mode trees; pin the engine's
+// parenthesized evaluation for the user's target structure
+// GROUP(GROUP(Field and (Field or Field)) or GROUP(Field and Field and
+// (Field or Field)) and GROUP(Field)) — plus a suggestion request
+// carrying a nested-any constraint (the mode-aware menu under real
+// nesting) — must be 200, never the empty-group 400.
+
+func TestFilterDeepGroupNesting(t *testing.T) {
+	setup := setupTestServer(t)
+	t.Cleanup(func() { _ = setup.Close() })
+
+	userID := getRegularUserID(t, setup.DB)
+	libUUID, _ := builderFixtureLib(t, setup, userID, "Deep")
+
+	titles := func(qf string) []string {
+		p := url.Values{"library_id": {libUUID.String()}, "qf": {qf}}
+		status, rows := qfSearch(t, setup, setup.RegularToken, p)
+		require.Contains(t, []int{http.StatusOK, http.StatusNotFound}, status)
+		return qfTitles(t, rows)
+	}
+
+	// root ALL[
+	//   ANY[ ALL[fantasy, ANY[>=250p, abridged]] ,  ALL[Dar, >=500p] ],
+	//   author not_contains Quill
+	// ]
+	// => Tide (fantasy + 300p), Wick (Dar + 700p); Fen dies at the root
+	// AND (Quill); Stone fails branch A (history) and branch B (Voss).
+	deep := map[string]interface{}{
+		"mode": "all",
+		"children": []interface{}{
+			map[string]interface{}{
+				"mode": "any",
+				"children": []interface{}{
+					map[string]interface{}{
+						"mode": "all",
+						"children": []interface{}{
+							qfRule("genre", "is", "fantasy"),
+							map[string]interface{}{
+								"mode": "any",
+								"children": []interface{}{
+									qfRule("page_count", "at_least", "250"),
+									qfRule("abridged", "is_true"),
+								},
+							},
+						},
+					},
+					map[string]interface{}{
+						"mode": "all",
+						"children": []interface{}{
+							qfRule("author", "contains", "Dar"),
+							qfRule("page_count", "at_least", "500"),
+						},
+					},
+				},
+			},
+			qfRule("author", "not_contains", "Quill"),
+		},
+	}
+	deepJSON, merr := json.Marshal(deep)
+	require.NoError(t, merr)
+	got := titles(string(deepJSON))
+	assert.ElementsMatch(t, []string{"Deep Tide", "Deep Wick"}, got,
+		"3-level mixed-mode nesting evaluates parenthesized")
+
+	// The same shape riding the SUGGEST endpoint (the mode-aware menu's
+	// constraint) — nested any must be a 200, never the empty-group 400.
+	p := url.Values{
+		"library_id": {libUUID.String()},
+		"author":     {""},
+		"limit":      {"20"},
+		"qf":         {string(deepJSON)},
+	}
+	req, _ := http.NewRequest("GET", setup.Server.URL+"/api/media-items/search?"+p.Encode(), nil)
+	req.Header.Set("Authorization", "Bearer "+setup.RegularToken)
+	resp, err := http.DefaultClient.Do(req)
+	require.NoError(t, err)
+	defer func() { _ = resp.Body.Close() }()
+	assert.Equal(t, http.StatusOK, resp.StatusCode,
+		"a nested-any constraint rides the suggestion endpoint cleanly: %s", p.Encode())
+}

templates/filter_builder.templ

@@ -11,11 +11,20 @@ templ FilterBuilderRows(countNoun string) {
 										<div>
 											<template x-if="row.type === 'groupOpen'">
 												<div :class="row.depth > 0 ? 'fb-nested' : ''" class="flex items-center gap-1.5 flex-wrap py-1" :style="'margin-left:' + (row.depth * 14) + 'px'">
-													<span class="text-[11px] font-semibold uppercase tracking-wide" style="color: var(--text-secondary)" x-text="row.depth === 0 ? 'Match' : 'Group'"></span>
+													<!-- THE group mode control (2026-11-01): the header was a dead label
+													while the engine honored group modes all along — clicking it now
+													flips ALL ⇄ ANY for that group. Root (path=[]) is the whole-query
+													switch; the remove × hides there (nothing to remove). -->
+													<button type="button" class="fb-group-mode" :class="groupMode(row.path) === 'any' ? 'fb-group-any' : ''" :aria-pressed="groupMode(row.path) === 'any'" :title="groupMode(row.path) === 'any' ? 'ANY — at least one rule in this group matches. Click for ALL.' : 'ALL — every rule in this group must match. Click for ANY.'" @click="toggleGroupMode(row.path)">
+													<span x-text="row.path.length === 0 ? 'Match' : 'Group'"></span>
+													<span x-text="groupMode(row.path) === 'any' ? 'ANY' : 'ALL'"></span>
+													</button>
 													<span class="flex-1"></span>
+													<template x-if="row.path.length > 0">
+														<button type="button" class="fb-mini-btn fb-danger" @click="removeNode(row.path)" aria-label="Remove group">×</button>
+													</template>
 													<button type="button" class="fb-mini-btn" @click="addRule(row.path)">+ rule</button>
 													<button type="button" class="fb-mini-btn" @click="addGroup(row.path)">+ group</button>
-													<button type="button" class="fb-mini-btn fb-danger" @click="removeNode(row.path)" aria-label="Remove group">×</button>
 												</div>
 											</template>
 											<template x-if="row.type === 'rule'">

templates/filter_builder_templ.go

@@ -35,14 +35,14 @@ func FilterBuilderRows(countNoun string) templ.Component {
 			templ_7745c5c3_Var1 = templ.NopComponent
 		}
 		ctx = templ.ClearChildren(ctx)
-		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 1, "<template x-for=\"row in builderRows\" :key=\"row.key\"><div><template x-if=\"row.type === 'groupOpen'\"><div :class=\"row.depth > 0 ? 'fb-nested' : ''\" class=\"flex items-center gap-1.5 flex-wrap py-1\" :style=\"'margin-left:' + (row.depth * 14) + 'px'\"><span class=\"text-[11px] font-semibold uppercase tracking-wide\" style=\"color: var(--text-secondary)\" x-text=\"row.depth === 0 ? 'Match' : 'Group'\"></span> <span class=\"flex-1\"></span> <button type=\"button\" class=\"fb-mini-btn\" @click=\"addRule(row.path)\">+ rule</button> <button type=\"button\" class=\"fb-mini-btn\" @click=\"addGroup(row.path)\">+ group</button> <button type=\"button\" class=\"fb-mini-btn fb-danger\" @click=\"removeNode(row.path)\" aria-label=\"Remove group\">×</button></div></template><template x-if=\"row.type === 'rule'\"><div :class=\"row.depth > 0 ? 'fb-nested' : ''\" class=\"flex items-center gap-1.5 flex-wrap py-0.5\" :style=\"'margin-left:' + ((row.depth + 1) * 14) + 'px'\"><button type=\"button\" class=\"fb-connective fb-connective-btn\" :class=\"row.chipClickable ? '' : 'fb-chip-static'\" x-show=\"!row.isFirst\" x-text=\"row.chip\" @click=\"toggleConnective(row)\" :title=\"row.chipClickable ? 'Switch this rule between AND / OR' : 'This rule joins with ' + row.chip\"></button><!-- field picker: grouped menu --><div class=\"relative\"><button type=\"button\" class=\"fb-picker\" :class=\"{'fb-picker-active': row.rule.field !== ''}\" @click=\"toggleMenu(row.key + ':field')\" x-text=\"fieldLabelOf(row.rule.field)\"></button><div class=\"fb-menu fb-menu-fields\" x-show=\"openMenu === row.key + ':field'\" @click.outside=\"openMenu = ''\"><div class=\"fb-menu-filter-wrap\"><input type=\"text\" class=\"fb-menu-filter\" placeholder=\"Filter fields…\" x-model=\"fieldFilter\" @keydown.enter.prevent @click.stop></div><div class=\"fb-menu-scroll\"><template x-for=\"grp in visibleFieldGroups\" :key=\"grp.group\"><div><div class=\"fb-menu-group\" x-text=\"grp.group\"></div><template x-for=\"f in grp.fields\" :key=\"f.key\"><button type=\"button\" class=\"fb-menu-item\" :class=\"row.rule.field === f.key ? 'fb-menu-item-active' : ''\" @click=\"setRuleField(row.path, f.key)\" x-text=\"f.label\"></button></template></div></template><div class=\"fb-menu-empty\" x-show=\"visibleFieldGroups.length === 0\">No matching fields</div></div></div></div><!-- operator picker (negation lives here) --><div class=\"relative\"><button type=\"button\" class=\"fb-picker fb-picker-op\" :class=\"{'fb-negated-text': isNegated(row.rule)}\" @click=\"toggleMenu(row.key + ':op')\" x-text=\"opLabelOf(row.rule)\"></button><div class=\"fb-menu\" x-show=\"openMenu === row.key + ':op'\" @click.outside=\"openMenu = ''\"><template x-for=\"o in opsFor(row.rule.field)\" :key=\"o.key\"><button type=\"button\" class=\"fb-menu-item\" :class=\"[row.rule.op === o.key ? 'fb-menu-item-active' : '', o.negated ? 'fb-negated-text' : '']\" @click=\"setRuleOp(row.path, o.key)\" x-text=\"o.label\"></button></template></div></div><!-- value cell: shape follows the operator + field kind --><template x-if=\"hasValueCell(row.rule) && valueArity(row.rule) === 'two'\"><span class=\"flex items-center gap-1\"><input type=\"text\" class=\"input fb-value\" :value=\"row.rule.values[0] || ''\" @input.debounce.250ms=\"setRuleValue(row.path, 0, $el.value)\" @focus=\"openValueMenu(row.key, row.path, row.rule)\" @click.outside=\"suggestionsOpen = ''\" placeholder=\"From\"> <span class=\"text-xs\" style=\"color: var(--text-secondary)\">and</span> <input type=\"text\" class=\"input fb-value\" :value=\"row.rule.values[1] || ''\" @input.debounce.250ms=\"setRuleValue(row.path, 1, $el.value)\" placeholder=\"To\"></span></template><template x-if=\"hasValueCell(row.rule) && (valueArity(row.rule) === 'one' || valueArity(row.rule) === 'many')\"><span class=\"fb-value-cell relative flex items-center gap-1\" :class=\"isIdValueRow(row.path) ? 'fb-chipbox flex-wrap' : ''\"><template x-if=\"isIdValueRow(row.path)\"><span class=\"contents\"><!-- picked values as removable chips: the box\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\twraps and grows instead of a 9rem input\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tyou can't read past the first entry --><template x-for=\"chip in idChipsFor(row.path)\" :key=\"chip.id\"><span class=\"fb-chip\" :title=\"chip.label\"><span class=\"fb-chip-label\" x-text=\"chip.label\"></span> <button type=\"button\" class=\"fb-chip-x\" :aria-label=\"'Remove ' + chip.label\" @click=\"removeIdChip(row.path, chip.id)\">×</button></span></template><input type=\"text\" class=\"fb-value fb-chip-input\" :value=\"idDraftFor(row.path)\" @input.debounce.250ms=\"onValueCellInput(row.path, $el.value)\" @focus=\"openValueMenu(row.key, row.path, row.rule)\" @keydown=\"chipInputKeydown(row.path, $event)\" :placeholder=\"valuePlaceholderFor(row.rule)\" :aria-label=\"fieldLabelOf(row.rule.field) + ' values'\"></span></template><template x-ifLine truncated
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 1, "<template x-for=\"row in builderRows\" :key=\"row.key\"><div><template x-if=\"row.type === 'groupOpen'\"><div :class=\"row.depth > 0 ? 'fb-nested' : ''\" class=\"flex items-center gap-1.5 flex-wrap py-1\" :style=\"'margin-left:' + (row.depth * 14) + 'px'\"><!-- THE group mode control (2026-11-01): the header was a dead label\n\t\t\t\t\t\t\t\t\t\t\t\t\twhile the engine honored group modes all along — clicking it now\n\t\t\t\t\t\t\t\t\t\t\t\t\tflips ALL ⇄ ANY for that group. Root (path=[]) is the whole-query\n\t\t\t\t\t\t\t\t\t\t\t\t\tswitch; the remove × hides there (nothing to remove). --><button type=\"button\" class=\"fb-group-mode\" :class=\"groupMode(row.path) === 'any' ? 'fb-group-any' : ''\" :aria-pressed=\"groupMode(row.path) === 'any'\" :title=\"groupMode(row.path) === 'any' ? 'ANY — at least one rule in this group matches. Click for ALL.' : 'ALL — every rule in this group must match. Click for ANY.'\" @click=\"toggleGroupMode(row.path)\"><span x-text=\"row.path.length === 0 ? 'Match' : 'Group'\"></span> <span x-text=\"groupMode(row.path) === 'any' ? 'ANY' : 'ALL'\"></span></button> <span class=\"flex-1\"></span><template x-if=\"row.path.length > 0\"><button type=\"button\" class=\"fb-mini-btn fb-danger\" @click=\"removeNode(row.path)\" aria-label=\"Remove group\">×</button></template><button type=\"button\" class=\"fb-mini-btn\" @click=\"addRule(row.path)\">+ rule</button> <button type=\"button\" class=\"fb-mini-btn\" @click=\"addGroup(row.path)\">+ group</button></div></template><template x-if=\"row.type === 'rule'\"><div :class=\"row.depth > 0 ? 'fb-nested' : ''\" class=\"flex items-center gap-1.5 flex-wrap py-0.5\" :style=\"'margin-left:' + ((row.depth + 1) * 14) + 'px'\"><button type=\"button\" class=\"fb-connective fb-connective-btn\" :class=\"row.chipClickable ? '' : 'fb-chip-static'\" x-show=\"!row.isFirst\" x-text=\"row.chip\" @click=\"toggleConnective(row)\" :title=\"row.chipClickable ? 'Switch this rule between AND / OR' : 'This rule joins with ' + row.chip\"></button><!-- field picker: grouped menu --><div class=\"relative\"><button type=\"button\" class=\"fb-picker\" :class=\"{'fb-picker-active': row.rule.field !== ''}\" @click=\"toggleMenu(row.key + ':field')\" x-text=\"fieldLabelOf(row.rule.field)\"></button><div class=\"fb-menu fb-menu-fields\" x-show=\"openMenu === row.key + ':field'\" @click.outside=\"openMenu = ''\"><div class=\"fb-menu-filter-wrap\"><input type=\"text\" class=\"fb-menu-filter\" placeholder=\"Filter fields…\" x-model=\"fieldFilter\" @keydown.enter.prevent @click.stop></div><div class=\"fb-menu-scroll\"><template x-for=\"grp in visibleFieldGroups\" :key=\"grp.group\"><div><div class=\"fb-menu-group\" x-text=\"grp.group\"></div><template x-for=\"f in grp.fields\" :key=\"f.key\"><button type=\"button\" class=\"fb-menu-item\" :class=\"row.rule.field === f.key ? 'fb-menu-item-active' : ''\" @click=\"setRuleField(row.path, f.key)\" x-text=\"f.label\"></button></template></div></template><div class=\"fb-menu-empty\" x-show=\"visibleFieldGroups.length === 0\">No matching fields</div></div></div></div><!-- operator picker (negation lives here) --><div class=\"relative\"><button type=\"button\" class=\"fb-picker fb-picker-op\" :class=\"{'fb-negated-text': isNegated(row.rule)}\" @click=\"toggleMenu(row.key + ':op')\" x-text=\"opLabelOf(row.rule)\"></button><div class=\"fb-menu\" x-show=\"openMenu === row.key + ':op'\" @click.outside=\"openMenu = ''\"><template x-for=\"o in opsFor(row.rule.field)\" :key=\"o.key\"><button type=\"button\" class=\"fb-menu-item\" :class=\"[row.rule.op === o.key ? 'fb-menu-item-active' : '', o.negated ? 'fb-negated-text' : '']\" @click=\"setRuleOp(row.path, o.key)\" x-text=\"o.label\"></button></template></div></div><!-- value cell: shape follows the operator + field kind --><template x-if=\"hasValueCell(row.rule) && valueArity(row.rule) === 'two'\"><span class=\"flex items-center gap-1\"><input type=\"text\" class=\"input fb-value\" :value=\"row.rule.values[0] || ''\" @input.debounce.250ms=\"setRuleValue(row.path, 0, $el.value)\" @focus=\"openValueMenu(row.key, row.path, row.rule)\" @click.outside=\"suggestionsOpen = ''\" placeholder=\"From\"> <span class=\"text-xs\" style=\"color: var(--text-secondary)\">and</span> <input type=\"text\" class=\"input fb-value\" :value=\"row.rule.values[1] || ''\" @input.debounce.250ms=\"setRuleValue(row.path, 1, $el.value)\" placeholder=\"To\"></span></template><template x-if=\"hasValueCell(row.rule) && (valueArity(row.rule) === 'one' || valueArity(row.rule) === 'many')\"><span class=\"fb-value-cell relative flex items-center gap-1\" :class=\"isIdValueRow(row.path) ? 'fb-chipbox flex-wrap' : ''\"><template x-if=\"isIdValueRow(row.path)\"><span class=\"contents\"><!-- picked values as removable chips: the box\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\twraps and grows instead of a 9rem input\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tyou caLine truncated
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
 		var templ_7745c5c3_Var2 string
 		templ_7745c5c3_Var2, templ_7745c5c3_Err = templ.ResolveAttributeValue("matchCountLoading ? 'counting…' : (matchCount === 1 ? '1 " + countNoun + " matches' : matchCount + ' " + countNoun + "s match')")
 		if templ_7745c5c3_Err != nil {
-			return templ.Error{Err: templ_7745c5c3_Err, FileName: `filter_builder.templ`, Line: 119, Col: 238}
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `filter_builder.templ`, Line: 128, Col: 238}
 		}
 		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ_7745c5c3_Var2)
 		if templ_7745c5c3_Err != nil {

web/src/filter_builder.test.ts

@@ -8,6 +8,7 @@ import {
   opsForField,
   pruneIncomplete,
   ruleToFlatParam,
+  suggestTree,
   type FilterGroupState,
   type FilterRuleState,
 } from "./filter_builder";
@@ -636,3 +637,96 @@ describe("init: embedded labels + form hydration", () => {
     expect(fetchSpy).not.toHaveBeenCalled();
   });
 });
+
+// ── group ALL/ANY header toggle (2026-11-01): the header was a dead
+// label while the engine honored group modes — now it's the control.
+// The dropdown audit rides with it: suggestTree was already
+// mode-generic; these pins lock that guarantee to the new shapes.
+describe("group ALL/ANY header toggle", () => {
+  beforeEach(() => {
+    ingestFilterFields(builderFields);
+  });
+
+  it("flips a NESTED group's mode; the row chips re-derive", () => {
+    const c = filterBuilderData();
+    c.filterTree = {
+      mode: "all",
+      children: [
+        { field: "author", op: "contains", values: ["a"] },
+        {
+          mode: "all",
+          children: [
+            { field: "author", op: "contains", values: ["b"] },
+            { field: "author", op: "contains", values: ["c"] },
+          ],
+        },
+      ],
+    };
+    expect(c.groupMode([1])).toBe("all");
+    c.toggleGroupMode([1]);
+    expect(c.groupMode([1])).toBe("any");
+    expect((c.filterTree.children[1] as FilterGroupState).mode).toBe("any");
+    // the projection mirrors the mode: the second rule inside the
+    // any-group now joins with OR
+    const orRow = c.builderRows.find((r) => r.chip === "OR");
+    expect(orRow).toBeDefined();
+  });
+
+  it("flips the ROOT (path=[]) — the whole-query switch rides the wire", () => {
+    const c = filterBuilderData();
+    c.filterTree = {
+      mode: "all",
+      children: [{ field: "author", op: "contains", values: ["a"] }],
+    };
+    expect(c.groupMode([])).toBe("all");
+    c.toggleGroupMode([]);
+    expect(c.filterTree.mode).toBe("any");
+    expect(c.treeJSON()).toContain('"mode":"any"');
+    c.toggleGroupMode([]);
+    expect(c.filterTree.mode).toBe("all");
+  });
+});
+
+describe("suggestTree under explicit groups (the group-toggle audit)", () => {
+  beforeEach(() => {
+    ingestFilterFields(builderFields);
+  });
+
+  it("root ANY: group siblings drop entirely (no constraint rides)", () => {
+    const tree: FilterGroupState = {
+      mode: "any",
+      children: [
+        {
+          mode: "all",
+          children: [{ field: "author", op: "contains", values: ["carroll"] }],
+        },
+        { field: "library", op: "in", values: ["lib-1"] },
+      ],
+    };
+    // editing the library rule: the author GROUP is an OR sibling — it
+    // must never narrow the menu
+    expect(suggestTree(tree, [1], "library")).toBeNull();
+  });
+
+  it("ALL root: a sibling explicit ANY-group survives with its mode intact", () => {
+    const tree: FilterGroupState = {
+      mode: "all",
+      children: [
+        { field: "author", op: "contains", values: ["a"] },
+        {
+          mode: "any",
+          children: [
+            { field: "author", op: "contains", values: ["carroll"] },
+            { field: "author", op: "contains", values: ["orwell"] },
+          ],
+        },
+      ],
+    };
+    const t = suggestTree(tree, [0], "author");
+    expect(t).not.toBeNull();
+    expect(t!.mode).toBe("all");
+    const nested = t!.children[0] as FilterGroupState;
+    expect(nested.mode).toBe("any");
+    expect(nested.children).toHaveLength(2);
+  });
+});

web/src/filter_builder.ts

@@ -543,6 +543,21 @@ export function filterBuilderData() {
 
     get builderRows(): BuilderRow[] {
       const rows: BuilderRow[] = [];
+      // The ROOT projects as its own header row (2026-11-01): its mode
+      // was invisible before — no header, no control, permanently "all".
+      // path=[] distinguishes it from explicit groups (whose labels read
+      // "Group"); nodeAt([]) IS the root, so the header's toggle reaches
+      // it like any other group.
+      rows.push({
+        key: "root",
+        path: [],
+        type: "groupOpen",
+        depth: 0,
+        chip: "AND",
+        chipClickable: false,
+        isFirst: true,
+        group: this.filterTree as FilterGroupState,
+      });
       projectRows(this.filterTree as FilterGroupState, [], 0, rows);
       return rows;
     },
@@ -617,6 +632,27 @@ export function filterBuilderData() {
       }
       return node;
     },
+    // groupMode — a group's current all/any (root included: path=[] IS
+    // the root via nodeAt). Anything malformed reads as "all".
+    groupMode(path: number[]): "all" | "any" {
+      const node = this.nodeAt(path);
+      if (!node || isRule(node)) return "all";
+      return node.mode === "any" ? "any" : "all";
+    },
+
+    // toggleGroupMode — the group header's flip: ALL ⇄ ANY for that
+    // group only. The engine has always honored group modes
+    // (buildGroupClause parenthesizes nested groups), so this is pure
+    // UI exposure; the row-level chips and implicit OR-blocks are
+    // untouched (they mix AND/OR inside a group — a different, orthogonal
+    // feature).
+    toggleGroupMode(path: number[]): void {
+      const node = this.nodeAt(path);
+      if (!node || isRule(node)) return;
+      node.mode = node.mode === "any" ? "all" : "any";
+      this._touch();
+    },
+
     addRule(path: number[]): void {
       const parent = this.nodeAt(path);
       if (!parent || !("children" in parent)) return;

web/static/input.css

@@ -2018,6 +2018,34 @@
     padding: 0.2rem 0.25rem;
     outline: none;
   }
+  /* group header = the ALL/ANY switch (2026-11-01): the header was a
+     dead label while the engine honored group modes — now it's the
+     control. ANY is accented: it's the mode that changes semantics. */
+  .fb-group-mode {
+    display: inline-flex;
+    align-items: center;
+    gap: 0.3rem;
+    font-size: 0.65rem;
+    font-weight: 700;
+    letter-spacing: 0.05em;
+    text-transform: uppercase;
+    padding: 0.15rem 0.5rem;
+    border-radius: 0.4rem;
+    border: 1px solid var(--border);
+    background-color: var(--bg-primary);
+    color: var(--text-secondary);
+    cursor: pointer;
+    white-space: nowrap;
+  }
+  .fb-group-mode:hover {
+    border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
+    color: var(--text-primary);
+  }
+  .fb-group-mode.fb-group-any {
+    border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
+    background-color: var(--accent-muted);
+    color: var(--accent);
+  }
   .fb-menu {
     position: absolute;
     z-index: 60;

web/static/style.css

@@ -1,2 +1,2 @@
 *,:after,:before{--tw-border-spacing-x:0;--tw-border-spacing-y:0;--tw-translate-x:0;--tw-translate-y:0;--tw-rotate:0;--tw-skew-x:0;--tw-skew-y:0;--tw-scale-x:1;--tw-scale-y:1;--tw-pan-x: ;--tw-pan-y: ;--tw-pinch-zoom: ;--tw-scroll-snap-strictness:proximity;--tw-gradient-from-position: ;--tw-gradient-via-position: ;--tw-gradient-to-position: ;--tw-ordinal: ;--tw-slashed-zero: ;--tw-numeric-figure: ;--tw-numeric-spacing: ;--tw-numeric-fraction: ;--tw-ring-inset: ;--tw-ring-offset-width:0px;--tw-ring-offset-color:#fff;--tw-ring-color:rgba(59,130,246,.5);--tw-ring-offset-shadow:0 0 #0000;--tw-ring-shadow:0 0 #0000;--tw-shadow:0 0 #0000;--tw-shadow-colored:0 0 #0000;--tw-blur: ;--tw-brightness: ;--tw-contrast: ;--tw-grayscale: ;--tw-hue-rotate: ;--tw-invert: ;--tw-saturate: ;--tw-sepia: ;--tw-drop-shadow: ;--tw-backdrop-blur: ;--tw-backdrop-brightness: ;--tw-backdrop-contrast: ;--tw-backdrop-grayscale: ;--tw-backdrop-hue-rotate: ;--tw-backdrop-invert: ;--tw-backdrop-opacity: ;--tw-backdrop-saturate: ;--tw-backdrop-sepia: ;--tw-contain-size: ;--tw-contain-layout: ;--tw-contain-paint: ;--tw-contain-style: }::backdrop{--tw-border-spacing-x:0;--tw-border-spacing-y:0;--tw-translate-x:0;--tw-translate-y:0;--tw-rotate:0;--tw-skew-x:0;--tw-skew-y:0;--tw-scale-x:1;--tw-scale-y:1;--tw-pan-x: ;--tw-pan-y: ;--tw-pinch-zoom: ;--tw-scroll-snap-strictness:proximity;--tw-gradient-from-position: ;--tw-gradient-via-position: ;--tw-gradient-to-position: ;--tw-ordinal: ;--tw-slashed-zero: ;--tw-numeric-figure: ;--tw-numeric-spacing: ;--tw-numeric-fraction: ;--tw-ring-inset: ;--tw-ring-offset-width:0px;--tw-ring-offset-color:#fff;--tw-ring-color:rgba(59,130,246,.5);--tw-ring-offset-shadow:0 0 #0000;--tw-ring-shadow:0 0 #0000;--tw-shadow:0 0 #0000;--tw-shadow-colored:0 0 #0000;--tw-blur: ;--tw-brightness: ;--tw-contrast: ;--tw-grayscale: ;--tw-hue-rotate: ;--tw-invert: ;--tw-saturate: ;--tw-sepia: ;--tw-drop-shadow: ;--tw-backdrop-blur: ;--tw-backdrop-brightness: ;--tw-backdrop-contrast: ;--tw-backdrop-grayscale: ;--tw-backdrop-hue-rotate: ;--tw-backdrop-invert: ;--tw-backdrop-opacity: ;--tw-backdrop-saturate: ;--tw-backdrop-sepia: ;--tw-contain-size: ;--tw-contain-layout: ;--tw-contain-paint: ;--tw-contain-style: }
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+/*! tailwindcss v3.4.19 | MIT License | https://tailwindcss.com*/*,:after,:before{box-sizing:border-box;border:0 solid #e5e7eb}:after,:before{--tw-content:""}:host,html{line-height:1.5;-webkit-text-size-adjust:100%;-moz-tab-size:4;-o-tab-size:4;tab-size:4;font-family:ui-sans-serif,system-ui,sans-serif,Noto Sans SC,Noto Sans TC,Noto Sans JP,Noto Sans KR,PingFang SC,Microsoft YaHei,Hiragino Sans,Apple SD Gothic Neo,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji;font-feature-settings:normal;font-variation-settings:normal;-webkit-tap-highlight-color:transparent}body{margin:0;line-height:inherit}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,pre,samp{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,Courier 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