improve consts and mode naming.

[vlebourl]

No description provided.

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 0.27%.

Quality metrics	Before	After	Change
Complexity	2.06 ⭐	2.04 ⭐	-0.02 👍
Method Length	30.69 ⭐	31.00 ⭐	0.31 👎
Working memory	4.55 ⭐	4.58 ⭐	0.03 👎
Quality	87.60% ⭐	87.33% ⭐	-0.27% 👎

Other metrics	Before	After	Change
Lines	182	185	3

Changed files	Quality Before	Quality After	Quality Change
custom_components/vesync/const.py	90.29% ⭐	89.38% ⭐	-0.91% 👎
custom_components/vesync/humidifier.py	87.11% ⭐	86.89% ⭐	-0.22% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation

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