test: suggesting, search-state, tab-handler + formula-tooltip & sparkline edges (#435, #436)
Add 118 tests:
- 48 tests: SuggestionSession grouping, SuggestionManager accept/reject
- 24 tests: SearchState findMatches, navigation, replace, case sensitivity
- 2 tests: tab-handler Tab/Shift+Tab resolution
- 14 tests: detectCurrentFunction parser edge cases (nesting, strings, commas)
- 30 tests: sparkline parseArgs, geometry, isSparklineResult edge cases