fix: Update device feature label input placeholder

[Terdious]

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Description of change

Fix: When you want to change the name of a feature in the charts and you completely delete the input field, it fills again with the original name of the feature. It's annoying!
https://community.gladysassistant.com/t/gladys-assistant-4-46-les-tableaux-de-bords/9112/3?u=terdious
https://community.gladysassistant.com/t/gladys-assistant-4-46-les-tableaux-de-bords/9112/5?u=terdious

and other Fix: when multiple devices present, deleting a device replaced the name of the next device

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.48%. Comparing base (7fce024) to head (545503b).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2127   +/-   ##
=======================================
  Coverage   98.48%   98.48%           
=======================================
  Files         867      867           
  Lines       14187    14187           
=======================================
  Hits        13972    13972           
  Misses        215      215           

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[relativeci]

#2768 Bundle Size — 10.23MiB (-0.02%).

545503b(current) vs 7fce024 master#2767(baseline)

Warning

Bundle contains 3 duplicate packages – View duplicate packages

Bundle metrics   4 changes 1 regression 1 improvement

	Current #2768	Baseline #2767
Initial JS	5.54MiB(-0.05%)	5.54MiB
Initial CSS	304.68KiB(+0.02%)	304.63KiB
Cache Invalidation	56.93%	0%
Chunks	51	51
Assets	171	171
Modules	1490(-0.13%)	1492
Duplicate Modules	21	21
Duplicate Code	0.83%	0.83%
Packages	124	124
Duplicate Packages	3	3

Bundle size by type   2 changes 1 regression 1 improvement

	Current #2768	Baseline #2767
JS	7.32MiB (-0.03%)	7.32MiB
IMG	2.48MiB	2.48MiB
CSS	321.47KiB (+0.02%)	321.42KiB
Fonts	93.55KiB	93.55KiB
Other	17.62KiB	17.62KiB
HTML	13.58KiB	13.58KiB

Bundle analysis report Branch Terdious:input-clear-default-val... Project dashboard

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[Pierre-Gilles]

Hi ! Thanks for this PR 🙏

If I remove the label then save, I get an error :

Kapture.2024-10-09.at.09.47.35.mp4

[Terdious]

If I remove the label then save, I get an error :

@Pierre-Gilles, tell me if this suits you, I took the following part:

• When you empty the field, it turns red with a shadow to warn.
  

• If you leave it like this and you no longer focus, it remains in a red frame
  

• If you save, it keeps the last name saved but authorizes the saving.
  This avoids specific error management, and no longer breaks the saving. But there is less information. Does this suit you anyway?

Otherwise I see for a specific error management that I had started before, but we agree that in this case it must be managed in front/src/routes/dashboard/edit-dashboard/index.js? To be sure ^^

[Pierre-Gilles]

Very nice, works fine on my side! 👏