WIP: Honor colorField when the marker field has format 'unique-string'

[fqueze]

[note: this is a WIP because I haven't fully reviewed it. I think it's OK or mostly OK, so anybody can feel free to take it over the finish line. I'm submitting this as PR to have a deploy preview, and so I don't lose it, but I'm not actively working on this right now.]

The marker chart's colorField lookup read the field value directly from the payload, but for fields with format 'unique-string' the payload holds a string-table index rather than the string itself, so the value never matched a valid GraphColor and the marker fell back to blue.

Add a getMarkerFieldValue helper in marker-schema.ts that dereferences unique-string / flow-id / terminating-flow-id field values through the string table, use it from MarkerChart Canvas, and collapse two existing inline copies of the same pattern (markerPayloadMatchesSearch and getGroupingValue) onto the helper. The console.warn calls in markerPayloadMatchesSearch that fired only for malformed profiles are dropped along the way.

[codecov]

Codecov Report

❌ Patch coverage is 92.30769% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.77%. Comparing base (61e5d10) to head (ecfaae1).
⚠️ Report is 98 commits behind head on main.

Files with missing lines	Patch %	Lines
src/profile-logic/marker-schema.ts	89.47%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6068      +/-   ##
==========================================
- Coverage   83.81%   83.77%   -0.05%     
==========================================
  Files         328      329       +1     
  Lines       34255    34550     +295     
  Branches     9572     9669      +97     
==========================================
+ Hits        28712    28945     +233     
- Misses       5115     5176      +61     
- Partials      428      429       +1     

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