diff --git a/frontend/src/App.jsx b/frontend/src/App.jsx
index c1efad7..81ecd1f 100644
--- a/frontend/src/App.jsx
+++ b/frontend/src/App.jsx
@@ -1,41 +1,39 @@
 import { useEffect, useMemo, useState } from "react";
 import {
   callSkill,
+  fileToBrowserDocument,
+  fixtureInvoices,
   loadAgentConfig,
   loadSession,
-  sampleArgs,
   signInUrl,
 } from "./a2a.js";
 
+const defaultCaseId = "studio-invoice-v1";
+
 export function App() {
   const [config, setConfig] = useState(null);
   const [session, setSession] = useState(null);
-  const [selectedSkillName, setSelectedSkillName] = useState("");
-  const [argsText, setArgsText] = useState("{}");
+  const [caseId, setCaseId] = useState(defaultCaseId);
+  const [invoiceText, setInvoiceText] = useState(JSON.stringify(fixtureInvoices(), null, 2));
+  const [documents, setDocuments] = useState([]);
   const [result, setResult] = useState(null);
   const [error, setError] = useState(null);
   const [running, setRunning] = useState(false);
+  const [decisionNote, setDecisionNote] = useState("Duplicate INV-100 needs AP review; INV-200 total does not match subtotal + tax.");
 
   useEffect(() => {
     loadAgentConfig()
-      .then((data) => {
+      .then(async (data) => {
         setConfig(data);
-        const firstSkill = data.skills?.[0];
-        if (firstSkill) {
-          setSelectedSkillName(firstSkill.name);
-          setArgsText(JSON.stringify(sampleArgs(firstSkill), null, 2));
+        try {
+          setSession(await loadSession(data));
+        } catch {
+          setSession({ authenticated: false });
         }
-        return loadSession(data).catch(() => null);
       })
-      .then((sessionData) => setSession(sessionData))
       .catch((err) => setError(err.message || String(err)));
   }, []);
 
-  const selectedSkill = useMemo(
-    () => config?.skills?.find((skill) => skill.name === selectedSkillName),
-    [config, selectedSkillName],
-  );
-
   const needsSignIn = Boolean(
     config?.auth?.invokeRequiresSession && session && !session.authenticated,
   );
@@ -44,115 +42,160 @@ export function App() {
     [config, needsSignIn],
   );
 
-  function selectSkill(skill) {
-    setSelectedSkillName(skill.name);
-    setArgsText(JSON.stringify(sampleArgs(skill), null, 2));
-    setResult(null);
-    setError(null);
-  }
-
-  async function runSkill(event) {
-    event.preventDefault();
-    if (!config || !selectedSkill) return;
+  async function invoke(skillName, args) {
+    if (!config) return null;
     setRunning(true);
     setError(null);
-    setResult(null);
     try {
-      const args = JSON.parse(argsText || "{}");
-      const data = await callSkill(config, selectedSkill.name, args);
+      const data = await callSkill(config, skillName, args);
       setResult(data);
+      return data;
     } catch (err) {
-      setError(err.message || String(err));
+      if (err.status === 401 && signInUrl(config)) {
+        setError("Your session expired. Use Sign in to run, then retry.");
+      } else {
+        setError(err.message || String(err));
+      }
+      return null;
     } finally {
       setRunning(false);
     }
   }
 
+  async function reviewPasted(event) {
+    event.preventDefault();
+    let invoices;
+    try {
+      invoices = JSON.parse(invoiceText);
+    } catch {
+      setError("Paste valid JSON: an array of invoice objects.");
+      return;
+    }
+    await invoke("review_invoices", { case_id: caseId, invoices });
+  }
+
+  async function reviewUploads(event) {
+    event.preventDefault();
+    if (!documents.length) {
+      setError("Choose a JSON, CSV, or text invoice file first.");
+      return;
+    }
+    await invoke("review_invoice_uploads", { case_id: caseId, documents });
+  }
+
+  async function reopenCase() {
+    await invoke("get_invoice_case", { case_id: caseId });
+  }
+
+  async function recordDecision() {
+    await invoke("record_decision", {
+      case_id: caseId,
+      decision: {
+        decision_id: "ap-review-1",
+        invoice_number: "INV-100",
+        decision: "needs_review",
+        note: decisionNote,
+      },
+    });
+  }
+
+  async function onFilesChanged(event) {
+    setError(null);
+    const files = Array.from(event.target.files || []);
+    if (files.length > 5) {
+      setError("Choose at most five files.");
+      return;
+    }
+    try {
+      setDocuments(await Promise.all(files.map(fileToBrowserDocument)));
+    } catch (err) {
+      setError(err.message || String(err));
+    }
+  }
+
   if (!config) {
-    return (
-      <main className="loading">
-        <p>{error || "Loading A2A agent contract..."}</p>
-      </main>
-    );
+    return <main className="loading"><p>{error || "Loading InvoiceGuard..."}</p></main>;
   }
 
   return (
-    <main className="app-shell">
-      <aside className="sidebar">
+    <main className="product-shell">
+      <section className="hero">
         <div>
-          <p className="eyebrow">A2A packed app</p>
-          <h1>invoice-guard-studio-v1</h1>
-          <p className="agent-meta">
-            {config.agent.name} v{config.agent.version}
+          <p className="eyebrow">InvoiceGuard Studio</p>
+          <h1>Catch duplicate invoices before payment.</h1>
+          <p className="lede">
+            Paste or upload invoices, deterministically flag duplicate invoice numbers and total mismatches,
+            save the review case to your user-scoped database, then reopen it after refresh.
           </p>
         </div>
-
-        <nav className="skill-list" aria-label="Agent skills">
-          {(config.skills || []).map((skill) => (
-            <button
-              className={skill.name === selectedSkillName ? "skill active" : "skill"}
-              key={skill.name}
-              onClick={() => selectSkill(skill)}
-              type="button"
-            >
-              <span>{skill.name}</span>
-              <small>{skill.stream ? "streaming" : "request"}</small>
-            </button>
-          ))}
-        </nav>
-
-        <div className="session">
-          <span>{session?.authenticated ? "Signed in" : needsSignIn ? "Signed out" : "Local session"}</span>
-          <strong>{session?.user?.email || session?.org?.slug || "dev@example.local"}</strong>
-          {/* Skills that spend the caller's LLM budget need a signed-in
-              visitor even when the page itself is public, so offer the way in
-              rather than failing at the first click. */}
-          {needsSignIn && signInHref ? (
-            <a className="signin" href={signInHref}>Sign in to run</a>
-          ) : null}
+        <div className="session-card" aria-live="polite">
+          <span>{session?.authenticated ? "Signed in" : "Signed out"}</span>
+          <strong>{session?.user?.email || session?.org?.slug || "Platform session required"}</strong>
+          {needsSignIn && signInHref ? <a className="signin" href={signInHref}>Sign in to run</a> : null}
         </div>
-      </aside>
+      </section>
 
-      <section className="workbench">
-        <header className="toolbar">
-          <div>
-            <p className="eyebrow">Skill runner</p>
-            <h2>{selectedSkill?.name || "No skills found"}</h2>
+      <section className="grid">
+        <form className="card input-card" onSubmit={reviewPasted}>
+          <h2>1. Review invoices</h2>
+          <label>
+            Case ID
+            <input value={caseId} onChange={(event) => setCaseId(event.target.value)} />
+          </label>
+          <label>
+            Invoice JSON
+            <textarea value={invoiceText} onChange={(event) => setInvoiceText(event.target.value)} spellCheck="false" />
+          </label>
+          <div className="button-row">
+            <button disabled={running || needsSignIn} type="submit">Review pasted invoices</button>
+            <button disabled={running || needsSignIn} type="button" onClick={reopenCase}>Reopen saved case</button>
           </div>
-          <a href={config.docs.base} rel="noreferrer" target="_blank">
-            Docs
-          </a>
-        </header>
+          <p className="hint">Failure fixture: remove vendor or total from an invoice to see safe incomplete-invoice validation.</p>
+        </form>
 
-        {selectedSkill ? (
-          <form className="runner" onSubmit={runSkill}>
-            <label>
-              Arguments JSON
-              <textarea
-                spellCheck="false"
-                value={argsText}
-                onChange={(event) => setArgsText(event.target.value)}
-              />
-            </label>
-            <button disabled={running} type="submit">
-              {running ? "Running..." : `Run ${selectedSkill.name}`}
-            </button>
-          </form>
-        ) : (
-          <p className="empty">Add a `@a2a.tool` to your agent to make it callable here.</p>
-        )}
+        <form className="card" onSubmit={reviewUploads}>
+          <h2>2. Upload bridge</h2>
+          <p className="muted">Browser files are converted to bounded base64 JSON for the packed app. External clients can still use the typed FileUpload tool.</p>
+          <label>
+            JSON, CSV, or text invoice file
+            <input type="file" accept="application/json,text/json,text/csv,text/plain,.json,.csv,.txt" multiple onChange={onFilesChanged} />
+          </label>
+          <p className="hint">{documents.length ? `${documents.length} document(s) ready.` : "Max 5 files, 256 KiB each."}</p>
+          <button disabled={running || needsSignIn || !documents.length} type="submit">Review uploaded invoices</button>
+        </form>
 
-        <section className="panels">
-          <div className="panel">
-            <h3>Input schema</h3>
-            <pre>{JSON.stringify(selectedSkill?.input_schema || {}, null, 2)}</pre>
-          </div>
-          <div className="panel">
-            <h3>Result</h3>
-            <pre>{error || JSON.stringify(result, null, 2) || "No run yet."}</pre>
-          </div>
+        <section className="card">
+          <h2>3. Decision receipt</h2>
+          <label>
+            Decision note
+            <textarea className="small" value={decisionNote} onChange={(event) => setDecisionNote(event.target.value)} />
+          </label>
+          <button disabled={running || needsSignIn} type="button" onClick={recordDecision}>Record AP decision</button>
+          <p className="hint">Review writes and production execution receipts are committed in one database transaction.</p>
         </section>
+
+        <ResultPanel result={result} error={error} running={running} />
       </section>
     </main>
   );
 }
+
+function ResultPanel({ result, error, running }) {
+  return (
+    <section className="card result-card" aria-live="polite">
+      <h2>Review result</h2>
+      {running ? <p className="muted">Running deterministic checks...</p> : null}
+      {error ? <div className="error">{error}</div> : null}
+      {!error && result?.ok ? (
+        <div className="summary">
+          <div><span>Case</span><strong>{result.case_id}</strong></div>
+          <div><span>Duplicates</span><strong>{result.duplicate_count}</strong></div>
+          <div><span>Total mismatches</span><strong>{result.total_mismatch_count}</strong></div>
+          <div><span>Receipt</span><strong>{result.receipt?.receipt_id || "saved"}</strong></div>
+        </div>
+      ) : null}
+      {!error && result?.ok === false ? <div className="error">{result.code}: {result.message}</div> : null}
+      <pre>{result ? JSON.stringify(result, null, 2) : "Run a review or reopen a case to see persisted evidence."}</pre>
+    </section>
+  );
+}