Brown retro sofa is now craftable (#94385)

## About The Pull Request

The "old ratty sofa" can now be crafted! Crafted version is called the
"retro sofa." Also grouped all craftable sofas under one dropdown menu
to reduce UI clutter.

<img width="702" height="439" alt="retro sofa coded"
src="https://github.com/user-attachments/assets/18a6f462-ffaf-4c8e-a64a-8247e9222578"
/>

## Why It's Good For The Game

The brown sofa looks right at home in cozy places like maints, library,
bar, even the command quarters. We had the model as a map spawn, so I
thought it'd be nice to give players the option to craft them too. Goes
well with wood! Also, reduced UI clutter by putting all sofas into one
drop-down menu.

code/game/objects/structures/beds_chairs/sofa.dm

@@ -51,6 +51,27 @@ path/corner/color_name {\
 COLORED_SOFA(/obj/structure/chair/sofa, brown, SOFA_BROWN)
 COLORED_SOFA(/obj/structure/chair/sofa, maroon, SOFA_MAROON)
 
+// Make crafted brown sofas use the "retro sofa" display name without changing map-spawned ones.
+/obj/structure/chair/sofa/middle/brown/Initialize(mapload)
+	. = ..()
+	if(!mapload)
+		name = "retro sofa"
+
+/obj/structure/chair/sofa/left/brown/Initialize(mapload)
+	. = ..()
+	if(!mapload)
+		name = "retro sofa"
+
+/obj/structure/chair/sofa/right/brown/Initialize(mapload)
+	. = ..()
+	if(!mapload)
+		name = "retro sofa"
+
+/obj/structure/chair/sofa/corner/brown/Initialize(mapload)
+	. = ..()
+	if(!mapload)
+		name = "retro sofa"
+
 // Original icon ported from Eris(?) and updated to work here.
 /obj/structure/chair/sofa/corp
 	name = "sofa"