Add single quotes around variables in API error messages

[Copilot]

Adds single quotes around all variable values in API client error messages for consistency and improved readability.

Changes

Updated three error messages in dandi/dandiapi.py:

• Dandiset not found: Quoted self.dandi_instance.gui URL

  f"View available Dandisets at '{self.dandi_instance.gui}'."

• Asset not found (by ID): Quoted dandiset context string

  f"No such asset: {asset_id!r} for '{self}'"

• Asset not found (by path): Quoted version identifier

  f"No asset at path {path!r} in version '{self.version_id}'."

Variables already using !r formatting retained their implicit quotes.

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[CodyCBakerPhD]

Ah, it's OK just leave it for a dedicated follow-up

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 50.45%. Comparing base (d3476d0) to head (16ced9c).

Files with missing lines	Patch %	Lines
dandi/dandiapi.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                 @@
##           enh-lad-errors-api    #1798   +/-   ##
===================================================
  Coverage               50.44%   50.45%           
===================================================
  Files                      84       84           
  Lines                   11920    11920           
===================================================
+ Hits                     6013     6014    +1     
+ Misses                   5907     5906    -1     

Flag	Coverage Δ
unittests	50.45% <0.00%> (+<0.01%)	⬆️

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