refactor(value): Use strconv.Quote to reveal hidden invalid characters in error messages

[Kybxd]

Problem

When a cell value contains invisible or non-printable characters (e.g., "2000-01-01\xc2\xa005:00:00" with a non-breaking space \xc2\xa0 embedded), the error message prints the value as-is, making it appear completely normal and correct to the user. This makes it extremely difficult to diagnose why the value fails to parse.

Solution

Wrap values with strconv.Quote() in error messages across all ParseFieldValue parsing branches, including:

• Integer types (int32, uint32, int64, uint64)
• Floating-point types (float, double)
• bool
• google.protobuf.Timestamp
• google.protobuf.Duration
• Well-known types: Fraction, Comparator, Version

strconv.Quote() produces a Go double-quoted string literal that escapes non-printable and non-ASCII bytes (e.g., "2000-01-01\xc2\xa005:00:00"), making hidden illegal characters immediately visible in error output.

Example

Before:

failed to parse value "2000-01-01 05:00:00" as google.protobuf.Timestamp

(looks correct — the non-breaking space is invisible)

After:

failed to parse value "2000-01-01\xc2\xa005:00:00" as google.protobuf.Timestamp

(the offending bytes \xc2\xa0 are now clearly visible)

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.91%. Comparing base (bc70718) to head (d813ed9).

Files with missing lines	Patch %	Lines
internal/x/xproto/value.go	66.66%	6 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #366   +/-   ##
=======================================
  Coverage   73.91%   73.91%           
=======================================
  Files          87       87           
  Lines        8664     8664           
=======================================
  Hits         6404     6404           
  Misses       1700     1700           
  Partials      560      560           

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[wenchy]

NOT a good idea. Use template func instead. Make use of sprig.

For example: {{ quote .Value }} or {{ .Value | quote }}

refer to:

• https://masterminds.github.io/sprig/
• https://helm.sh/docs/chart_template_guide/functions_and_pipelines/