Fix blank screen on Analyze; add mode selector to result view

showResultView now only activates after results exist (not during loading),
preventing AnimatePresence from blanking the screen mid-transition.
Adds a mode selector + Analyze button at the top of the result view so
additional modes can be run without leaving the page.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/App.jsx

@@ -54,10 +54,8 @@ function App() {
   const COMMITTABLE_MODES = new Set(['plain_ocr', 'describe', 'freeform'])
   const MODE_LABELS = { plain_ocr: 'OCR Text', describe: 'Description', freeform: 'Freeform' }
 
-  // Show the full-screen result view when any committable mode has a result (or is loading)
-  const showResultView = view === 'new_job' && (
-    Object.keys(modeResults).length > 0 || (loading && COMMITTABLE_MODES.has(mode))
-  )
+  // Show the full-screen result view once at least one committable mode has a result
+  const showResultView = view === 'new_job' && Object.keys(modeResults).length > 0
 
   const handleFileTypeChange = useCallback((newType) => {
     setImage(null)
@@ -254,7 +252,7 @@ function App() {
       <main className="max-w-7xl mx-auto px-6 py-6">
         <AnimatePresence mode="wait">
 
-          {/* ── Full-screen OCR result view (plain_ocr + result) ── */}
+          {/* ── Full-screen OCR result view ── */}
           {showResultView ? (
             <motion.div
               key="ocr_result"
@@ -263,6 +261,29 @@ function App() {
               exit={{ opacity: 0, y: -20 }}
               className="flex flex-col gap-4"
             >
+              {/* Run additional modes */}
+              <div className="glass p-4 rounded-2xl flex-shrink-0">
+                <ModeSelector
+                  mode={mode} onModeChange={setMode}
+                  prompt={prompt} onPromptChange={setPrompt}
+                  findTerm={findTerm} onFindTermChange={setFindTerm}
+                />
+                <div className="flex items-center gap-3 mt-3">
+                  <motion.button
+                    onClick={handleSubmit}
+                    disabled={loading}
+                    className={`flex items-center gap-2 px-5 py-2 rounded-xl font-medium text-sm transition-all ${loading ? 'opacity-50 cursor-not-allowed bg-white/5' : 'bg-gradient-to-r from-purple-600 to-cyan-600'}`}
+                    whileHover={!loading ? { scale: 1.02 } : {}}
+                    whileTap={!loading ? { scale: 0.98 } : {}}
+                  >
+                    {loading
+                      ? <><Loader2 className="w-4 h-4 animate-spin" /> Processing...</>
+                      : <><Zap className="w-4 h-4" /> Analyze</>}
+                  </motion.button>
+                  {error && <p className="text-sm text-red-400">{error}</p>}
+                </div>
+              </div>
+
               {/* Image + Text */}
               <div className="grid gap-6" style={{ gridTemplateColumns: '1fr 1fr', height: '130vh' }}>
                 {imagePreview && typeof imagePreview === 'string' ? (