refactor: remove unsafe Search chart assertions

[KJ21-ENG]

Explanation of Change

Search charts now check the expense group before reading labels or composing filters. Matching groups retain their labels and results; a mismatched type returns an empty label or query, and absent optional labels remain empty.

Fixed Issues

$ #94739
PROPOSAL: #94739 (comment)

Tests

The diff changes src/components/Search/chartGroupByConfig.ts and adds tests/unit/Search/chartGroupByConfigTest.ts. The new test covers ten matching groups, mismatches, optional labels, date queries, and zero account ID.

Offline tests

QA Steps

• 1. Category chart drilldown.

  • In Expenses Search, keep a filter that includes expenses from multiple categories.
  • Choose Category grouping and Bar view.
  • Select a known category.
  • Expect its label to be correct and the resulting table to retain the original filter while showing only that category's expenses.
  • Reset and confirm the original results return.

• 2. Month chart drilldown.

  • With expenses spanning two months, choose Month grouping and Line view.
  • Inspect a point's label/tooltip, then select it.
  • Expect the correct month labels, inclusive start/end dates for that month, the original filter retained, and only the selected month's expenses.
  • Reset and confirm the original results return.

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
• I wrote clear testing steps that cover the changes made in this PR
  • I added steps for local testing in the Tests section
  • I added steps for the expected offline behavior in the Offline steps section
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Screenshots/Videos

Recordings (2)

01-category-bar-desktop.mp4

02-month-line-desktop.mp4

[codecov]

Codecov Report

✅ Changes either increased or maintained existing code coverage, great job!

Files with missing lines	Coverage Δ
src/components/Search/chartGroupByConfig.ts	90.00% <100.00%> (+74.78%)	⬆️
... and 15 files with indirect coverage changes