Add Electronics category and fix DEPOSITO shown as expense

DEPOSITO transactions (salaries) were displaying with negative sign and
red styling. Flipped logic so only COMPRA is negative; DEPOSITO and
DEVOLUCION both show as positive income.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/app/seed.py

@@ -17,7 +17,7 @@ DEFAULT_CATEGORIES = [
     ("Food & Delivery", "utensils", "uber eats,rappi,mcdonalds,subway,pizza,restaurant,soda,cafe,coyote ugly,el rodeo,steak house"),
     ("Utilities", "zap", "c.n.f.l,cnfl,ice,aya,claro cr telecomunicaciones"),
     ("Transportation", "car", "gasolina,gasolinera,uber rides,didi,parqueo,parking,peaje,estacion de servicio,estac.de serv"),
-    ("Shopping", "shopping-bag", "amazon,ebay,ticotek,construplaza,epa,novex,novedades chayfer,total imports,tiendalaliga,gnc live well"),
+    ("Shopping", "shopping-bag", "amazon,ebay,construplaza,epa,novex,novedades chayfer,total imports,tiendalaliga,gnc live well"),
     ("Entertainment", "film", "netflix,disney,cine,steam,playstation,blizzard,diablo"),
     ("Health", "heart-pulse", "farmacia,hospital,clinica,laboratorio,optica,medicina regenerativa,neumi,doer fitness,kettlebell,lacrosse"),
     ("Education", "graduation-cap", "universidad,udemy,coursera,libro"),
@@ -27,6 +27,7 @@ DEFAULT_CATEGORIES = [
     ("Telecom", "phone", "liberty,tigo,kolbi"),
     ("Parking & Fees", "circle-parking", "centro comercial curridabat,debito compass,cobro administr,compass"),
     ("Auto", "car-front", "auto lavado,lavado"),
+    ("Electronics", "cpu", "extremetechcr,extreme tech,ticotek,ishop,gollo,radioshack"),
     ("Lab & Medical", "microscope", "laboratorio echandi"),
     ("Other", "tag", ""),
 ]