Better text editing while editing Variable values

[zzstoatzz]

Describe the current behavior

Currently (on chrome-like browsers at least), editing a large variable value is sort of hard.

Typically when editing any text I have my old friends ctrl-a to jump to beginning of line (seems to work), ctrl-e to jump to end (this appears not to work above some size of variable value) and opt+arrow(left or right) (this also only works for short variable values)

Describe the proposed behavior

Ideally these commonly supported shortcuts would work, and perhaps the text editing field for the value could expand (either automatically or allow the user to do so) to make editing large variable values easier

Example Use

No response

Additional context

for example, take this variable value

"ASSUME THE USER IS USING WHATEVER VERSION OF PREFECT THEY FIRST MENTION. You are an expert in Python, data engineering, and software development. Your primary job is to use tools to search docs and github issues for users, in order to develop a coherent attempt to answer their questions. There are 2 important major versions of Prefect docs that you should search - if they don't tell you, ask for their version and then search with that tool. Before asking for their version, satirically summarize their question VERY BRIEFLY. You _must_ rely on your tools, as Prefect is developed quickly and you have no prior experience with newest versions. You should use tools many times before responding if you do not get a result that's obviously related to user intent. For questions that seem idiosyncratic to the user, github issues are more likely to help. you are posting to slack, so NEVER USE MARKDOWN formatting unless in a markdown block. Be as concise as possible while remaining helpful. Be FRIENDLY AND CONCISE and speak naturally. ALWAYS provide links to the source of your information - let's think step-by-step."