feat: All tab groups tools by modality with collapsible sections

The All tab now shows tools organized by modality (Image, Video,
Audio, Documents, Data) with each section showing a colored icon,
tool count, and collapse toggle. Categories are nested within each
modality. Collapse state persists in localStorage so enterprise
users can hide modalities they don't use.

Modality tabs still show the flat category view for focused browsing.

apps/web/src/pages/home-page.tsx

@@ -1,7 +1,7 @@
 import type { Tool } from "@snapotter/shared";
-import { CATEGORIES, TOOLS } from "@snapotter/shared";
-import { Search, X } from "lucide-react";
-import { useEffect, useMemo, useRef, useState } from "react";
+import { CATEGORIES, MODALITIES, TOOLS } from "@snapotter/shared";
+import { ChevronDown, Search, X } from "lucide-react";
+import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import { Link, useLocation, useNavigate } from "react-router-dom";
 import { ToolCard } from "@/components/common/tool-card.js";
 import { AppLayout } from "@/components/layout/app-layout.js";
@@ -10,6 +10,7 @@ import { useFuseSearch } from "@/hooks/use-fuse-search.js";
 import { usePageTitle } from "@/hooks/use-page-title.js";
 import { useRecentTools } from "@/hooks/use-recent-tools.js";
 import { format } from "@/lib/format.js";
+import { ICON_MAP } from "@/lib/icon-map.js";
 import { getCategoryName, getToolName } from "@/lib/tool-i18n.js";
 import { cn } from "@/lib/utils.js";
 import { useSettingsStore } from "@/stores/settings-store";
@@ -19,6 +20,29 @@ interface TabDef {
   label: string;
 }
 
+const COLLAPSE_STORAGE_KEY = "snapotter-collapsed-modalities";
+
+function getCollapsedModalities(): Set<string> {
+  try {
+    const raw = localStorage.getItem(COLLAPSE_STORAGE_KEY);
+    return raw ? new Set(JSON.parse(raw)) : new Set();
+  } catch {
+    return new Set();
+  }
+}
+
+function saveCollapsedModalities(collapsed: Set<string>) {
+  localStorage.setItem(COLLAPSE_STORAGE_KEY, JSON.stringify([...collapsed]));
+}
+
+const MODALITY_TAB_ORDER = [
+  { modalityId: "image", tabKey: "image", label: "Image" },
+  { modalityId: "video", tabKey: "video", label: "Video" },
+  { modalityId: "audio", tabKey: "audio", label: "Audio" },
+  { modalityId: "document", tabKey: "document", label: "Documents" },
+  { modalityId: "file", tabKey: "data", label: "Data" },
+];
+
 export function HomePage() {
   const { t } = useTranslation();
   const [activeTab, setActiveTab] = useState<string>("all");
@@ -113,8 +137,10 @@ export function HomePage() {
 
           {search ? (
             <SearchResults results={searchResults} query={search} onClear={() => setSearch("")} />
+          ) : activeTab === "all" ? (
+            <AllTabContent recentTools={recentTools} visibleTools={visibleTools} />
           ) : (
-            <ToolGrid recentTools={recentTools} groupedTools={groupedTools} />
+            <CategoryGrid groupedTools={groupedTools} />
           )}
         </div>
       </div>
@@ -255,19 +281,46 @@ function SearchResults({
   );
 }
 
-// ── Tool Grid (used by both All tab and modality tabs) ───────────
+// ── All Tab: Grouped by modality, then by category ───────────────
 
-function ToolGrid({
+function AllTabContent({
   recentTools,
-  groupedTools,
+  visibleTools,
 }: {
   recentTools: Tool[];
-  groupedTools: Map<string, Tool[]>;
+  visibleTools: Tool[];
 }) {
   const { t } = useTranslation();
+  const [collapsed, setCollapsed] = useState<Set<string>>(getCollapsedModalities);
+
+  const toggleModality = useCallback((modalityId: string) => {
+    setCollapsed((prev) => {
+      const next = new Set(prev);
+      if (next.has(modalityId)) next.delete(modalityId);
+      else next.add(modalityId);
+      saveCollapsedModalities(next);
+      return next;
+    });
+  }, []);
+
+  const toolsByModality = useMemo(() => {
+    const map = new Map<string, Map<string, Tool[]>>();
+    for (const tool of visibleTools) {
+      let modMap = map.get(tool.modality);
+      if (!modMap) {
+        modMap = new Map();
+        map.set(tool.modality, modMap);
+      }
+      const existing = modMap.get(tool.category);
+      if (existing) existing.push(tool);
+      else modMap.set(tool.category, [tool]);
+    }
+    return map;
+  }, [visibleTools]);
 
   return (
     <div className="space-y-6">
+      {/* Recent */}
       {recentTools.length > 0 && (
         <section>
           <h2 className="text-[11px] font-semibold uppercase text-muted-foreground/70 tracking-widest mb-2">
@@ -287,6 +340,86 @@ function ToolGrid({
         </section>
       )}
 
+      {/* Modality sections */}
+      {MODALITY_TAB_ORDER.map(({ modalityId, label }) => {
+        const categoryMap = toolsByModality.get(modalityId);
+        if (!categoryMap || categoryMap.size === 0) return null;
+
+        const totalCount = [...categoryMap.values()].reduce((sum, arr) => sum + arr.length, 0);
+        const isCollapsed = collapsed.has(modalityId);
+        const modality = MODALITIES.find((m) => m.id === modalityId);
+        const ModalityIcon = modality
+          ? (ICON_MAP[modality.icon] as React.ComponentType<{ className?: string }>)
+          : null;
+
+        return (
+          <section key={modalityId}>
+            <button
+              type="button"
+              onClick={() => toggleModality(modalityId)}
+              className="w-full flex items-center gap-2 py-2 mb-2 border-b border-border/40 group cursor-pointer"
+            >
+              {ModalityIcon && (
+                <div
+                  className="p-1 rounded"
+                  style={{
+                    backgroundColor: `${modality?.color ?? "#6B7280"}15`,
+                    color: modality?.color ?? "#6B7280",
+                  }}
+                >
+                  <ModalityIcon className="h-4 w-4" />
+                </div>
+              )}
+              <span className="text-sm font-semibold text-foreground">{label}</span>
+              <span className="text-xs text-muted-foreground">{totalCount}</span>
+              <div className="flex-1" />
+              <ChevronDown
+                className={cn(
+                  "h-4 w-4 text-muted-foreground transition-transform",
+                  isCollapsed && "-rotate-90",
+                )}
+              />
+            </button>
+
+            {!isCollapsed && (
+              <div className="space-y-5 ps-1">
+                {CATEGORIES.filter((cat) => categoryMap.has(cat.id)).map((category) => {
+                  const tools = categoryMap.get(category.id) ?? [];
+                  return (
+                    <div key={category.id}>
+                      <h3 className="text-[11px] font-semibold uppercase text-muted-foreground/50 tracking-widest mb-1.5">
+                        {getCategoryName(t, category.id, category.name)}
+                      </h3>
+                      <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-2">
+                        {tools.map((tool) => (
+                          <ToolCard key={tool.id} tool={tool} variant="descriptive" />
+                        ))}
+                      </div>
+                    </div>
+                  );
+                })}
+              </div>
+            )}
+          </section>
+        );
+      })}
+    </div>
+  );
+}
+
+// ── Category Grid (used by modality tabs) ────────────────────────
+
+function CategoryGrid({ groupedTools }: { groupedTools: Map<string, Tool[]> }) {
+  const { t } = useTranslation();
+
+  if (groupedTools.size === 0) {
+    return (
+      <p className="text-center text-muted-foreground py-16">{t.fullscreenGrid.noToolsFound}</p>
+    );
+  }
+
+  return (
+    <div className="space-y-6">
       {CATEGORIES.filter((cat) => groupedTools.has(cat.id)).map((category) => {
         const tools = groupedTools.get(category.id) ?? [];
         return (