[NFC] Optimize source filenames to match the original ID

[Kyle-Ye]

Summary

• Rename source files across OpenSwiftUI and OpenSwiftUICore to better match
  SwiftUI's original filenames (e.g. Color+CGColor → CGColorConversions,
  ViewFactory → PlatformViewFactory, Signpost → Signposts)
• Fix ID hash mismatches caused by incorrect filename mappings
  (e.g. CommandsFlags → CommandFlag, RepeatAnimiation → RepeatAnimation)
• Move CoreUIDefaultSystemColorDefinition content from SystemColors.swift
  to its correct dedicated file
• Update .gitignore and ID comments

[augmentcode]

🤖 Augment PR Summary

Summary: This PR is a non-functional cleanup to align OpenSwiftUI/OpenSwiftUICore source filenames and embedded IDs with SwiftUI’s original file naming/ID mapping.

Changes:

• Renamed many source files to better match expected SwiftUI filename conventions (e.g. Signpost → Signposts, ViewFactory → PlatformViewFactory).
• Adjusted file header ID annotations to remove “?” markers and correct a few mismatches.
• Fixed ID hash mismatches that were caused by incorrect filename mappings (e.g. CommandsFlags → CommandFlag, RepeatAnimiation → RepeatAnimation).
• Moved CoreUIDefaultSystemColorDefinition out of SystemColors.swift into its own dedicated file alongside CoreUI-related code.
• Removed/updated a couple of stale ID header lines in OpenSwiftUICore.
• Updated .gitignore to include .alma-snapshots.

Technical Notes: Primary impact is source organization and ID consistency; functional behavior should remain unchanged aside from resolving ID/hash mapping discrepancies.

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[augmentcode]

Review completed. 1 suggestion posted.

Comment augment review to trigger a new review at any time.

[augmentcode]

CoreUIDefaultSystemColorDefinition.value contains an inner #if canImport(Darwin) && OPENSWIFTUI_LINK_COREUI with an #else fallback, but this file is already wrapped in the same file-level #if, making the fallback unreachable. If this type is referenced from non-CoreUI builds, this move could also make the symbol unavailable—worth double-checking the conditional compilation intent here.

Severity: medium

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[codecov]

Codecov Report

❌ Patch coverage is 81.25000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 27.24%. Comparing base (c24fa1c) to head (507cbdf).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...hic/Color/CoreUIDefaultSystemColorDefinition.swift	81.25%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #826      +/-   ##
==========================================
+ Coverage   27.16%   27.24%   +0.07%     
==========================================
  Files         667      662       -5     
  Lines       42963    42448     -515     
==========================================
- Hits        11671    11565     -106     
+ Misses      31292    30883     -409     

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