feat(match2): make sets available by default

[Rathoz]

Summary

TODO/Followup PR:

• Bold the set name
• Game vods should be within the set

How did you test this change?

Tested on chess

[Copilot]

Pull request overview

This PR makes “sets” (submatches/subgroups) available by default for match2-based match parsing and rendering, enabling match summaries to group games into sets and show set-level headers/results without requiring wiki-specific opt-ins.

Changes:

• Always compute match.submatches in MatchGroupUtil.matchFromRecord and always assign map.subgroup during standard map processing.
• Update multiple wiki MatchSummary/MatchGroup implementations to rely on match.submatches directly (and remove legacy ADD_SUB_GROUP usage).
• Add a new SetHeader widget (plus SCSS) and integrate it into the default MatchSummary body rendering when GameRow is used.

Reviewed changes

Copilot reviewed 20 out of 20 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
stylesheets/commons/Brackets.scss	Adds a flex helper class for centering set header content in match summary headers.
lua/wikis/warcraft/MatchSummary.lua	Renames off-factions helper and simplifies submatch selection; adjusts return annotations.
lua/wikis/warcraft/MatchGroup/Util/Custom.lua	Uses precomputed match.submatches; renames computeOffFactions; adds (but currently incorrect) type annotations.
lua/wikis/warcraft/MatchGroup/Input/Custom.lua	Removes ADD_SUB_GROUP from map parser config.
lua/wikis/stormgate/MatchSummary.lua	Mirrors warcraft changes: off-factions naming, simplified submatch selection, annotations.
lua/wikis/stormgate/MatchGroup/Util/Custom.lua	Uses precomputed match.submatches; adds (currently incorrect) type annotations.
lua/wikis/stormgate/MatchGroup/Input/Custom.lua	Removes ADD_SUB_GROUP from map parser config.
lua/wikis/hearthstone/MatchSummary.lua	Simplifies team submatch selection logic.
lua/wikis/hearthstone/MatchGroup/Util/Custom.lua	Uses precomputed match.submatches; adds (currently incorrect) type annotation.
lua/wikis/hearthstone/MatchGroup/Input/Custom.lua	Removes ADD_SUB_GROUP and leaves an empty map parser config table.
lua/wikis/commons/Widget/Match/Summary/SetHeader.lua	New widget that computes and renders set-level win/loss indicators and score.
lua/wikis/commons/Widget/Match/Summary/All.lua	Exposes the new SetHeader widget via the summary widget bundle.
lua/wikis/commons/MatchSummary/Starcraft.lua	Simplifies submatch selection logic; adjusts return annotations.
lua/wikis/commons/MatchSummary/Base.lua	Integrates set grouping + set headers into default body rendering when GameRow is provided.
lua/wikis/commons/MatchGroup/Util/Starcraft.lua	Uses precomputed match.submatches when constructing submatches.
lua/wikis/commons/MatchGroup/Util.lua	Always computes match.submatches in matchFromRecord; documents submatches on the match type.
lua/wikis/commons/MatchGroup/Input/Util.lua	Removes ADD_SUB_GROUP concept and always assigns map.subgroup incrementally by default.
lua/wikis/commons/MatchGroup/Input/Starcraft.lua	Removes ADD_SUB_GROUP from map parser config.
lua/wikis/clashroyale/MatchGroup/Input/Custom.lua	Removes ADD_SUB_GROUP from map parser config.
lua/wikis/chess/MatchSummary.lua	Removes stray blank lines (format-only).

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