fix: parseo JSON robusto, UI upload full-width, selector en header, multiple files

- session-analyzer.ts: extractJSON() con 4 estrategias de parseo + log raw
- TranscriptionsView: selector proyecto movido al header, upload card full-width
- TranscriptionsView: soporte multi-file con cola, banner de progreso
- TranscriptionsView: download .md con revokeObjectURL diferido
- TranscriptionsView: upload deshabilitado sin proyecto seleccionado
- session-analyzer + project-doc exportados como servicios independientes
- i18n: keys titleView, statusParsing/Analyzing/Generating, filesLoaded
- i18n: fix key title duplicado (title -> titleLabel)

src/i18n/locales/en.json

@@ -249,6 +249,7 @@
   },
   "transcriptions": {
     "title": "Transcriptions",
+    "titleView": "Transcriptions",
     "subtitle": "Manage project sessions. Upload transcripts, analyze with AI, and maintain an incremental document.",
     "configureAI": "Configure AI",
     "aiKeyTitle": "OpenRouter API Key",
@@ -276,9 +277,13 @@
     "selected": "selected",
     "createInKappa": "Create {count} in KAPPA",
     "type": "Type",
-    "title": "Title",
+    "titleLabel": "Title",
     "priority": "Priority",
     "selectProjectToCreate": "Select a project above to create stories in KAPPA",
+    "statusParsing": "Processing files...",
+    "statusAnalyzing": "Analyzing session with AI...",
+    "statusGenerating": "Generating project document...",
+    "filesLoaded": "files loaded",
     "analyzeSession": "Analyze session",
     "sessionError": "Error analyzing session",
     "sessionSummary": "Summary",
@@ -299,6 +304,7 @@
     "updatedAt": "Updated:",
     "docViewer": "Session document",
     "selectProjectHint": "Select a project to view its sessions",
+    "selectProjectFirst": "Select a project to start",
     "sessionCount": "{count} sessions | {count} session | {count} sessions"
   },
   "projectAi": {