feat: update PDF tool pages with interactive options, promote split/compress to phase 1

- pdf-split: page range input (1-3,5,7-9) with example
- pdf-compress: upload zone with description
- tool-grid: split/compress jadi phase 1 (backend udah implement)
- merge/images-to-pdf tetap phase 2 (butuh multi-file upload)

Co-Authored-By: Kilo <kilo@kilo.ai>

frontend/src/app/pdf/compress/page.tsx

@@ -16,10 +16,7 @@ export default function PdfCompressPage() {
   const [jobId, setJobId] = useState<string | null>(null);
   const [errorMsg, setErrorMsg] = useState<string | null>(null);
 
-  const { upload } = useUpload({
-    tool: "pdf-compress",
-    options: { quality: 80 },
-  });
+  const { upload } = useUpload({ tool: "pdf-compress" });
 
   const handleComplete = useCallback(() => setPageState("result"), []);
   const handleError = useCallback(
@@ -58,44 +55,28 @@ export default function PdfCompressPage() {
       title="Compress PDF"
       description="Kecilin ukuran PDF"
       icon={FileImage}
-      phase={2}
+      phase={1}
     >
       {pageState === "upload" && (
         <UploadZone
-          accept="application/pdf"
+          accept=".pdf,application/pdf"
           tool="pdf-compress"
           onUpload={handleUpload}
         />
       )}
 
       {pageState === "processing" && jobId && (
-        <ProgressBar
-          progress={progress}
-          stage={stage}
-          message={message}
-          status={status}
-          onRetry={handleRetry}
-        />
+        <ProgressBar progress={progress} stage={stage} message={message} status={status} onRetry={handleRetry} />
       )}
 
       {pageState === "result" && result && (
-        <ResultPreview
-          result={result}
-          onProcessAnother={handleRetry}
-        />
+        <ResultPreview result={result} onProcessAnother={handleRetry} />
       )}
 
       {pageState === "error" && (
         <div className="p-6 rounded-xl border border-destructive/20 bg-destructive/5 text-center">
-          <p className="text-destructive font-medium mb-4">
-            {errorMsg || "Terjadi kesalahan"}
-          </p>
-          <button
-            onClick={handleRetry}
-            className="px-4 py-2 bg-primary text-primary-foreground rounded-lg hover:opacity-90"
-          >
-            Coba Lagi
-          </button>
+          <p className="text-destructive font-medium mb-4">{errorMsg || "Terjadi kesalahan"}</p>
+          <button onClick={handleRetry} className="px-4 py-2 bg-primary text-primary-foreground rounded-lg hover:opacity-90">Coba Lagi</button>
         </div>
       )}
     </ToolLayout>

frontend/src/app/pdf/split/page.tsx

@@ -15,10 +15,11 @@ export default function PdfSplitPage() {
   const [pageState, setPageState] = useState<PageState>("upload");
   const [jobId, setJobId] = useState<string | null>(null);
   const [errorMsg, setErrorMsg] = useState<string | null>(null);
+  const [pages, setPages] = useState("1,3-5");
 
   const { upload } = useUpload({
     tool: "pdf-split",
-    options: { quality: 80 },
+    options: { pages },
   });
 
   const handleComplete = useCallback(() => setPageState("result"), []);
@@ -56,46 +57,46 @@ export default function PdfSplitPage() {
   return (
     <ToolLayout
       title="Split PDF"
-      description="Ekstrak halaman tertentu"
+      description="Ekstrak halaman tertentu dari PDF"
       icon={Split}
-      phase={2}
+      phase={1}
     >
       {pageState === "upload" && (
+        <div className="space-y-6">
+          <div className="p-6 rounded-xl border glass space-y-3">
+            <h3 className="font-semibold">Page Range</h3>
+            <p className="text-xs text-muted-foreground">
+              Contoh: <code className="bg-muted px-1 rounded">1-3,5,7-9</code> ambil halaman 1-3, 5, dan 7-9
+            </p>
+            <input
+              type="text"
+              value={pages}
+              onChange={(e) => setPages(e.target.value)}
+              className="w-full bg-muted border rounded px-3 py-2 text-sm font-mono"
+              placeholder="1-3,5,7-9"
+            />
+          </div>
+
           <UploadZone
-          accept="application/pdf"
+            accept=".pdf,application/pdf"
             tool="pdf-split"
             onUpload={handleUpload}
           />
+        </div>
       )}
 
       {pageState === "processing" && jobId && (
-        <ProgressBar
-          progress={progress}
-          stage={stage}
-          message={message}
-          status={status}
-          onRetry={handleRetry}
-        />
+        <ProgressBar progress={progress} stage={stage} message={message} status={status} onRetry={handleRetry} />
       )}
 
       {pageState === "result" && result && (
-        <ResultPreview
-          result={result}
-          onProcessAnother={handleRetry}
-        />
+        <ResultPreview result={result} onProcessAnother={handleRetry} />
       )}
 
       {pageState === "error" && (
         <div className="p-6 rounded-xl border border-destructive/20 bg-destructive/5 text-center">
-          <p className="text-destructive font-medium mb-4">
-            {errorMsg || "Terjadi kesalahan"}
-          </p>
-          <button
-            onClick={handleRetry}
-            className="px-4 py-2 bg-primary text-primary-foreground rounded-lg hover:opacity-90"
-          >
-            Coba Lagi
-          </button>
+          <p className="text-destructive font-medium mb-4">{errorMsg || "Terjadi kesalahan"}</p>
+          <button onClick={handleRetry} className="px-4 py-2 bg-primary text-primary-foreground rounded-lg hover:opacity-90">Coba Lagi</button>
         </div>
       )}
     </ToolLayout>

frontend/src/components/tools/tool-grid.tsx

@@ -82,10 +82,10 @@ const tools: ToolDefinition[] = [
   {
     id: "pdf-split",
     title: "Split PDF",
-    description: "Ekstrak halaman tertentu dari PDF. Pilih via thumbnail atau range.",
+    description: "Ekstrak halaman tertentu dari PDF. Pilih page range seperti 1-3,5,7-9.",
     icon: Split,
     href: "/pdf/split",
-    phase: 2,
+    phase: 1,
   },
   {
     id: "images-to-pdf",
@@ -98,10 +98,10 @@ const tools: ToolDefinition[] = [
   {
     id: "pdf-compress",
     title: "Compress PDF",
-    description: "Kecilin ukuran PDF dengan kompresi embedded images.",
+    description: "Kecilin ukuran PDF dengan kompresi ulang.",
     icon: FileImage,
     href: "/pdf/compress",
-    phase: 2,
+    phase: 1,
   },
   {
     id: "video-compress",