feat(web): modality filter tabs in sidebar tool panel

Add horizontal filter tabs (All, Image, Video, Audio, Documents, Files)
above the search bar so users can instantly scope the 157-tool catalog to
one modality. Active tab uses the modality accent color. In "all" mode
file-modality tools remain merged into the document section; selecting a
specific modality tab shows only that modality with its own header.

apps/web/src/components/layout/tool-panel.tsx

@@ -1,17 +1,21 @@
-import { CATEGORIES, MODALITIES, TOOLS } from "@snapotter/shared";
+import { CATEGORIES, MODALITIES, type Modality, TOOLS } from "@snapotter/shared";
 import { useEffect, useMemo, useState } from "react";
 import { useTranslation } from "@/contexts/i18n-context";
 import { useFuseSearch } from "@/hooks/use-fuse-search";
 import { ICON_MAP } from "@/lib/icon-map";
 import { getCategoryName, getModalityName } from "@/lib/tool-i18n";
+import { cn } from "@/lib/utils";
 import { useFeaturesStore } from "@/stores/features-store";
 import { useSettingsStore } from "@/stores/settings-store";
 import { SearchBar } from "../common/search-bar";
 import { ToolCard } from "../common/tool-card";
 
+type ModalityFilter = "all" | Modality;
+
 export function ToolPanel() {
   const { t } = useTranslation();
   const [search, setSearch] = useState("");
+  const [selectedModality, setSelectedModality] = useState<ModalityFilter>("all");
   const { disabledTools, experimentalEnabled, loaded, fetch } = useSettingsStore();
   const fetchFeatures = useFeaturesStore((s) => s.fetch);
 
@@ -32,12 +36,20 @@ export function ToolPanel() {
     });
   }, [disabledTools, experimentalEnabled, loaded]);
 
-  const filteredTools = useFuseSearch(visibleTools, search);
+  const modalityFilteredTools = useMemo(() => {
+    if (selectedModality === "all") return visibleTools;
+    return visibleTools.filter((tool) => tool.modality === selectedModality);
+  }, [visibleTools, selectedModality]);
+
+  const filteredTools = useFuseSearch(modalityFilteredTools, search);
 
   const groupedByModality = useMemo(() => {
     const byModality = new Map<string, Map<string, typeof TOOLS>>();
     for (const tool of filteredTools) {
-      const key = tool.modality === "file" ? "document" : tool.modality;
+      // In "all" mode, merge file-modality tools into the document section;
+      // when a specific tab is active, keep the original modality key.
+      const key =
+        selectedModality === "all" && tool.modality === "file" ? "document" : tool.modality;
       const cats = byModality.get(key) ?? new Map<string, typeof TOOLS>();
       const list = cats.get(tool.category) ?? [];
       list.push(tool);
@@ -45,58 +57,98 @@ export function ToolPanel() {
       byModality.set(key, cats);
     }
     return byModality;
-  }, [filteredTools]);
+  }, [filteredTools, selectedModality]);
 
   return (
     <div className="w-72 border-r border-border bg-background overflow-y-auto flex flex-col shrink-0">
       <div className="p-3 sticky top-0 bg-background z-10">
+        {/* Modality filter tabs */}
+        <div className="flex gap-1 overflow-x-auto scrollbar-none mb-2 -mx-0.5 px-0.5">
+          <button
+            type="button"
+            onClick={() => setSelectedModality("all")}
+            className={cn(
+              "shrink-0 px-2.5 py-1 rounded-md text-xs font-medium transition-colors",
+              selectedModality === "all"
+                ? "bg-primary/10 text-primary"
+                : "text-muted-foreground hover:text-foreground hover:bg-muted",
+            )}
+          >
+            All
+          </button>
+          {MODALITIES.map((m) => {
+            const Icon = ICON_MAP[m.icon] as React.ComponentType<{ className?: string }>;
+            const isActive = selectedModality === m.id;
+            return (
+              <button
+                key={m.id}
+                type="button"
+                onClick={() => setSelectedModality(m.id)}
+                className={cn(
+                  "shrink-0 flex items-center gap-1 px-2 py-1 rounded-md text-xs font-medium transition-colors",
+                  !isActive && "text-muted-foreground hover:text-foreground hover:bg-muted",
+                )}
+                style={isActive ? { backgroundColor: `${m.color}20`, color: m.color } : undefined}
+              >
+                {Icon && <Icon className="h-3 w-3" />}
+                <span>{m.name}</span>
+              </button>
+            );
+          })}
+        </div>
         <SearchBar value={search} onChange={setSearch} />
       </div>
       <div className="px-3 pb-4 flex-1">
-        {MODALITIES.filter((m) => m.id !== "file" && groupedByModality.has(m.id)).map(
-          (modality, idx, arr) => {
-            const ModalityIcon = ICON_MAP[modality.icon] as React.ComponentType<{
-              className?: string;
-            }>;
-            const categoryMap = groupedByModality.get(modality.id);
-            if (!categoryMap) return null;
-            const isLast = idx === arr.length - 1;
-            return (
-              <div key={modality.id} className={isLast ? "" : "mb-2"}>
-                {idx > 0 && <hr className="border-border mb-4" />}
-                <div
-                  className="flex items-center gap-2 mt-4 mb-3 pl-2.5 border-l-[3px] rounded-sm"
-                  style={{ borderColor: modality.color }}
-                >
-                  {ModalityIcon && (
-                    <span className="shrink-0" style={{ color: modality.color }}>
-                      <ModalityIcon className="h-4.5 w-4.5" />
-                    </span>
+        {MODALITIES.filter((m) => {
+          // In "all" mode, file-modality tools are merged into the document
+          // section so skip the standalone file entry. When the file tab is
+          // active, keep it.
+          if (selectedModality === "all" && m.id === "file") return false;
+          return groupedByModality.has(m.id);
+        }).map((modality, idx, arr) => {
+          const ModalityIcon = ICON_MAP[modality.icon] as React.ComponentType<{
+            className?: string;
+          }>;
+          const categoryMap = groupedByModality.get(modality.id);
+          if (!categoryMap) return null;
+          const isLast = idx === arr.length - 1;
+          return (
+            <div key={modality.id} className={isLast ? "" : "mb-2"}>
+              {idx > 0 && <hr className="border-border mb-4" />}
+              <div
+                className="flex items-center gap-2 mt-4 mb-3 pl-2.5 border-l-[3px] rounded-sm"
+                style={{ borderColor: modality.color }}
+              >
+                {ModalityIcon && (
+                  <span className="shrink-0" style={{ color: modality.color }}>
+                    <ModalityIcon className="h-4.5 w-4.5" />
+                  </span>
+                )}
+                <h2 className="text-sm font-semibold text-foreground tracking-wide">
+                  {getModalityName(
+                    t,
+                    modality.id,
+                    modality.id === "document" && selectedModality === "all"
+                      ? "Documents & Files"
+                      : modality.name,
                   )}
-                  <h2 className="text-sm font-semibold text-foreground tracking-wide">
-                    {getModalityName(
-                      t,
-                      modality.id,
-                      modality.id === "document" ? "Documents & Files" : modality.name,
-                    )}
-                  </h2>
-                </div>
-                {CATEGORIES.filter((cat) => categoryMap.has(cat.id)).map((category) => (
-                  <div key={category.id} className="mb-3">
-                    <h3 className="text-xs font-medium text-muted-foreground tracking-wider mb-1.5 pl-1">
-                      {getCategoryName(t, category.id, category.name)}
-                    </h3>
-                    <div className="space-y-0.5">
-                      {categoryMap.get(category.id)?.map((tool) => (
-                        <ToolCard key={tool.id} tool={tool} />
-                      ))}
-                    </div>
-                  </div>
-                ))}
+                </h2>
               </div>
-            );
-          },
-        )}
+              {CATEGORIES.filter((cat) => categoryMap.has(cat.id)).map((category) => (
+                <div key={category.id} className="mb-3">
+                  <h3 className="text-xs font-medium text-muted-foreground tracking-wider mb-1.5 pl-1">
+                    {getCategoryName(t, category.id, category.name)}
+                  </h3>
+                  <div className="space-y-0.5">
+                    {categoryMap.get(category.id)?.map((tool) => (
+                      <ToolCard key={tool.id} tool={tool} />
+                    ))}
+                  </div>
+                </div>
+              ))}
+            </div>
+          );
+        })}
         {filteredTools.length === 0 && (
           <p className="text-sm text-muted-foreground text-center py-8">No tools found</p>
         )}