Add missing amssymb relation symbols

[Jason-Abbott]

Add commonly-used amssymb relation symbols missing from MathAtomFactory.supportedLatexSymbols.

Source: TeXShop 5.57 completion.plist Symbols panel and Gratzer Math command completion list.

Symbols to Add

Add to supportedLatexSymbols dictionary in Sources/MathViews/MathRender/MathAtomFactory.swift (around line 270, in the Relations section):

Command	Type	Unicode	Description
\lesssim	.relation	U+2272	Less-than or equivalent to
\gtrsim	.relation	U+2273	Greater-than or equivalent to
\lll	.relation	U+22D8	Very much less-than
\ggg	.relation	U+22D9	Very much greater-than
\lessgtr	.relation	U+2276	Less-than or greater-than
\gtrless	.relation	U+2277	Greater-than or less-than
\lesseqgtr	.relation	U+22DA	Less-than equal or greater-than
\gtreqless	.relation	U+22DB	Greater-than equal or less-than

Implementation

Each is a one-line dictionary entry following the exact pattern of existing amssymb entries (lines 277-342):

"lesssim" : MathAtom(type: .relation, value: "\u{2272}"),
"gtrsim" : MathAtom(type: .relation, value: "\u{2273}"),
"lll" : MathAtom(type: .relation, value: "\u{22D8}"),
"ggg" : MathAtom(type: .relation, value: "\u{22D9}"),
"lessgtr" : MathAtom(type: .relation, value: "\u{2276}"),
"gtrless" : MathAtom(type: .relation, value: "\u{2277}"),
"lesseqgtr" : MathAtom(type: .relation, value: "\u{22DA}"),
"gtreqless" : MathAtom(type: .relation, value: "\u{22DB}"),

Checklist

• Add 8 symbols to supportedLatexSymbols
• Add tests in MathListBuilderTests.swift verifying parse round-trip
• Verify glyphs render in Latin Modern Math font

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