feat: display snackbar when offline

[rhbrunetto]

Changes

• Lets user know if there's no network connection

Checklist

• PR is ready for review (if not, it should be a draft).
• PR title follows Conventional Commits guidelines.
• Screenshots/video added.
• Tests added.
• Self-review done.

[codecov]

Codecov Report

Merging #911 (50d3b83) into master (19579a9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #911   +/-   ##
=======================================
  Coverage   79.15%   79.15%           
=======================================
  Files         181      181           
  Lines        3934     3934           
=======================================
  Hits         3114     3114           
  Misses        820      820           

Flag	Coverage Δ
solana-beta	79.15% <ø> (?)
solana-stable	79.15% <ø> (ø)

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