Wall and table stealth combo

## Testmerges
#12627: 'Tyrargo Rift (2) - Various Alterations' by Steelpoint at commit 73b8f408b2
#12640: 'Fuel pumps have health during hijack + bullet ping fix + trapper shotgun flag fix' by Drulikar at commit 149d40c8b6
#12721: 'Assorted Sound Fixes' by fira at commit 85e10735bf
#12824: 'Bundles Wound Overlay Updates' by fira at commit 6b48f2d5f1
#12825: 'Optimize /datum/controller/subsystem/minimaps/proc/add_marker' by fira at commit 1a869a8443
#12753: 'PR Stack - Movement Optimizations' by fira at commit 3082e3cb2b
#12322: 'Fort McNeil - (Lowpop) Ground Map' by Steelpoint at commit d16cb3bb7b
#12895: 'Research rework - Xenobiology edition' by Watermelon914 at commit 42c46ca058

## Round ID
35790

## Description of the bug
South facing and flipped tables directly against a wall to the south causes human sprites to be completely hidden while leaning on the wall. Uncertain if this works for cades or not.

## What's the difference with what should have happened?
See above. While I'd assume at least part of the sprite would be visible, the size of the flipped table (and maybe cade) sprite and placement of the human sprite when leaning against a wall makes it impossible to see while in the room.

## How do we reproduce this bug?
1. Build or find a table with a wall directly to its south
2. Flip table on its side
3. Lean against the wall the table is functionally pressed against

## Attached logs
```
N/A
```

## Additional details
- Author: FGRSentinel
- Admin: Spypig23
- Note: None

Reproduce the issue in round 35790 by placing or finding a table against a south wall, flipping it, and leaning against the wall. Trace the table, wall, and leaning human sprite placement or layering; done means the human remains at least partly visible, with cade behavior checked if relevant.

Written by the indexing model from the issue text.