fix: indexer manager UI behaviour + class naming

[SeDemal]

Make indexer manager scaling behave like the other widget.
Fixed improper base flex behaviour.
Added class naming to all components.

[deepsource-io]

Here's the code health analysis summary for commits 9fb6e67..365809c. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
JavaScript	✅ Success		View Check ↗

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[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	39.57%	13241 / 33456
🔵	Statements	39.57%	13241 / 33456
🔵	Functions	36.54%	360 / 985
🔵	Branches	71.46%	1202 / 1682

File Coverage

File	Stmts	% Branch	% Funcs	% Lines	Uncovered Lines
Changed Files
packages/widgets/src/indexer-manager/component.tsx	0%	0%	0%	0%	1, 3-5, 7, 9, 12, 14-22, 24, 26-37, 39, 41-43, 45-59, 61-64, 66-75, 77-81, 83-101, 103-105, 107

Generated in workflow #2900