feat: Improve OCR adaptive pipeline with early exit and better pattern matching

- Add adaptive 3-step OCR pipeline with early exit when all 5 fields found
- Add pattern for "C. I. F." with spaces (OCR artifact from PaddleOCR)
- Add pattern for YYYY. MM. DD date format with spaces (OMV/Petrom receipts)
- Add pattern for "OTAL TAXE" with T cut off and reversed amount position
- Make TVA rate pattern more flexible (code letter optional, handle "-21%")
- Replace logger.info with print(flush=True) for better debugging visibility
- Improve OCRPreview.vue to show extraction progress and raw OCR text

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

data-entry-app/frontend/src/components/ocr/OCRPreview.vue

@@ -106,14 +106,27 @@
 
       <!-- Raw Text Toggle -->
       <div class="raw-text-section" v-if="data.raw_text">
-        <Button
-          :label="showRawText ? 'Ascunde text OCR' : 'Arata text OCR'"
-          :icon="showRawText ? 'pi pi-eye-slash' : 'pi pi-eye'"
-          severity="secondary"
-          size="small"
-          text
-          @click="showRawText = !showRawText"
-        />
+        <div class="raw-text-header">
+          <Button
+            :label="showRawText ? 'Ascunde text OCR' : 'Arata text OCR'"
+            :icon="showRawText ? 'pi pi-eye-slash' : 'pi pi-eye'"
+            severity="secondary"
+            size="small"
+            text
+            @click="showRawText = !showRawText"
+          />
+          <span v-if="data.ocr_engine" class="ocr-engine-badge" :class="getEngineClass(data.ocr_engine)">
+            <i :class="getEngineIcon(data.ocr_engine)"></i>
+            {{ getEngineLabel(data.ocr_engine) }}
+          </span>
+          <span v-if="data._ocr_message" class="ocr-message-badge" :class="getMessageClass(data._ocr_message)">
+            {{ data._ocr_message }}
+          </span>
+          <span v-if="data.processing_time_ms" class="ocr-time-badge">
+            <i class="pi pi-clock"></i>
+            {{ formatProcessingTime(data.processing_time_ms) }}
+          </span>
+        </div>
         <div v-if="showRawText" class="raw-text">
           <pre>{{ data.raw_text }}</pre>
         </div>
@@ -168,6 +181,45 @@ const formatDate = (dateStr) => {
     year: 'numeric'
   })
 }
+
+const getEngineClass = (engine) => {
+  if (!engine) return ''
+  if (engine === 'paddle-light') return 'fast'
+  if (engine === 'paddle-adaptive') return 'adaptive'
+  if (engine === 'adaptive-full') return 'full'
+  if (engine.includes('paddle')) return 'paddleocr'
+  if (engine.includes('tesseract')) return 'tesseract'
+  return ''
+}
+
+const getEngineIcon = (engine) => {
+  if (!engine) return 'pi pi-cog'
+  if (engine === 'paddle-light') return 'pi pi-bolt'  // Fast/lightning
+  if (engine === 'adaptive-full') return 'pi pi-cog'  // Full pipeline
+  return 'pi pi-cog'
+}
+
+const getEngineLabel = (engine) => {
+  if (!engine) return ''
+  if (engine === 'paddle-light') return 'Fast Mode (PaddleOCR)'
+  if (engine === 'paddle-adaptive') return 'Adaptive (Paddle dual)'
+  if (engine === 'adaptive-full') return 'Full Pipeline'
+  if (engine.includes('paddle')) return 'PaddleOCR'
+  if (engine.includes('tesseract')) return 'Tesseract'
+  return engine
+}
+
+const getMessageClass = (message) => {
+  if (!message) return ''
+  if (message.includes('fast mode')) return 'fast-mode'
+  if (message.includes('full pipeline')) return 'full-pipeline'
+  return ''
+}
+
+const formatProcessingTime = (ms) => {
+  if (ms < 1000) return `${ms}ms`
+  return `${(ms / 1000).toFixed(1)}s`
+}
 </script>
 
 <style scoped>
@@ -305,6 +357,82 @@ const formatDate = (dateStr) => {
   border-top: 1px dashed #86efac;
 }
 
+.raw-text-header {
+  display: flex;
+  align-items: center;
+  flex-wrap: wrap;
+  gap: 0.75rem;
+}
+
+.ocr-engine-badge {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.25rem;
+  padding: 0.25rem 0.5rem;
+  border-radius: 4px;
+  font-size: 0.75rem;
+  font-weight: 500;
+}
+
+.ocr-engine-badge.paddleocr {
+  background: #dbeafe;
+  color: #1e40af;
+}
+
+.ocr-engine-badge.tesseract {
+  background: #fef3c7;
+  color: #92400e;
+}
+
+.ocr-engine-badge.fast {
+  background: #dcfce7;
+  color: #166534;
+}
+
+.ocr-engine-badge.adaptive {
+  background: #dbeafe;
+  color: #1e40af;
+}
+
+.ocr-engine-badge.full {
+  background: #fef3c7;
+  color: #92400e;
+}
+
+.ocr-message-badge {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.25rem;
+  padding: 0.25rem 0.5rem;
+  border-radius: 4px;
+  font-size: 0.75rem;
+  font-weight: 500;
+  background: #f1f5f9;
+  color: #475569;
+}
+
+.ocr-message-badge.fast-mode {
+  background: #dcfce7;
+  color: #166534;
+}
+
+.ocr-message-badge.full-pipeline {
+  background: #fef3c7;
+  color: #92400e;
+}
+
+.ocr-time-badge {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.25rem;
+  padding: 0.25rem 0.5rem;
+  border-radius: 4px;
+  font-size: 0.75rem;
+  font-weight: 600;
+  background: #e0e7ff;
+  color: #3730a3;
+}
+
 .raw-text {
   margin-top: 0.5rem;
   padding: 0.75rem;

data-entry-app/frontend/src/components/ocr/OCRUploadZone.vue

@@ -143,7 +143,12 @@ const processOCR = async () => {
     })
 
     if (response.data.success) {
-      emit('ocr-result', response.data.data)
+      // Include the OCR message in the data for debugging
+      const resultData = {
+        ...response.data.data,
+        _ocr_message: response.data.message
+      }
+      emit('ocr-result', resultData)
     } else {
       error.value = response.data.message || 'OCR processing failed'
       emit('error', error.value)