Apply AlignAssignmentStatement overhaul from PR #2132

[Copilot]

Ports the AlignAssignmentStatement rule rewrite from PR #2132 to fix several correctness and performance issues in hashtable alignment, and adds enum member value alignment.

Rule fixes

• Expression keys with =: e.g. ($Key = 5) = "Value" previously caused Start position cannot be before End position — the rule was finding the wrong = token
• Inline comments erased: Key <#comment#> = "Value" had the comment stripped during auto-correction
• Quadratic perf: Per-KVP linear token scan made large files (~1000 hashtables × 100 KVP) take 457s → now ~2s via a single pre-pass token index

New features

• Enum member value alignment (CheckEnums, IncludeValuelessEnumMembers, AlignEnumMemberWithInterveningComment)
• AlignHashtableKvpWithInterveningComment setting to opt into aligning KVPs with intervening comments
• Partial alignment: invalid/multi-line KVPs are now skipped individually rather than bailing on the entire hashtable

Breaking change

All new settings default to $true. Previously CheckHashtable defaulted to $false, so the rule was effectively a no-op by default; enabling it now does something meaningful.

Also fixed

Minor typos in comments and docs (trvially → trivially, it's → its, Enum's → Enums).

[andyleejordan]

Copilot bad.