Cell names in variable explorer not connected to cells

[anjiro]

Describe the bug

I have a moderate-sized notebook with 25 cells. When I open the variable explorer, I get a nice list of variables and the cells that are using them. However, those are named as cell-N. The cells themselves have no numbers on them, and when I click the cell menu, I see a name in the box like cell_Hstk.

I see when I click on a cell I get a blue highlight around the cell, but it is rather subtle and fades fairly quickly. Especially when there's an exception in the cell, the border reverts to being thick and red, which makes that blue border even harder to see.

I'd suggest maybe displaying cell numbers next to the cells, maybe optionally only when the Variables window is open?

Environment

{
  "marimo": "0.3.1",
  "OS": "Darwin",
  "OS Version": "23.3.0",
  "Processor": "arm",
  "Python Version": "3.11.2",
  "Binaries": {
    "Chrome": "122.0.6261.112",
    "Node": "v21.6.2"
  },
  "Requirements": {
    "black": "23.3.0",
    "click": "8.1.3",
    "jedi": "0.18.2",
    "pymdown-extensions": "10.7",
    "starlette": "0.36.1",
    "tomlkit": "0.12.3",
    "typing_extensions": "4.9.0",
    "uvicorn": "0.27.0.post1"
  }
}

Code to reproduce

No response