Add S52 lint rule for detecting duplicate cases in switch statements

[Copilot]

Implement a new lint rule (S52) to detect duplicate case values within switch statements, addressing the request to identify unreachable duplicate case branches.

Changes

• New S52 Lint Rule: Detects when the same value appears as multiple cases in a switch statement, with diagnostics pointing to the first occurrence
• Syntax Support: Handles both SQF case syntaxes (case VALUE : EXPR and case VALUE do EXPR)
• Test Coverage: Comprehensive test file covering simple duplicates, multiple duplicates, variable cases, and default cases

Example

The lint now correctly identifies this common issue:

switch (_minDist) do {
    case _distLeft:   { [  0,         _y ] };
    case _distRight:  { [ _worldSize, _y ] };
    case _distBottom: { [ _x,          0 ] };
    case _distBottom: { [ _x, _worldSize ] };  // L-S52: Duplicate case
};

All existing lint tests pass with no regressions.

• Fixes Suggestion - Lint: Detect duplicated cases in switch statements #1321

[codecov]

Codecov Report

❌ Patch coverage is 62.85714% with 65 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.0%. Comparing base (c2fd31b) to head (39b9683).

Files with missing lines	Patch %	Lines
libs/sqf/src/analyze/lints/s52_duplicate_case.rs	62.8%	65 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
libs/sqf/src/analyze/lints/s52_duplicate_case.rs	62.8% <62.8%> (ø)

... and 2 files with indirect coverage changes

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[PabstMirror]

no

[PabstMirror]

invalid syntax

Suggested change

	case default { "other" };
	default { "other" };

[PabstMirror]

case x do {} isn't a thing
I guess technically case returns "Switch Type"
but it just doesn't work

[PabstMirror]

should also think about single case expressions

switch test do {
    case 1;
    case 2: { "X" };
    case 1: { "Y"};
};