Add terminal view mode to stdout renderer

[Kyle-Ye]

Summary

• add a terminal-cell view mode alongside the existing display-list stdout output
• render solid colors and macOS text content with terminal-aware placement and ANSI color output
• detect terminal dimensions and color capabilities, with explicit configuration overrides
• update the stdout example, documentation, and focused renderer coverage

Motivation

The stdout renderer previously exposed only textual display-list commands. A terminal view provides a compact visual representation that is useful for local renderer development and diagnostics while preserving the existing display-list mode.

Validation

• Focused stdout renderer suite passes (10 tests)
• The macOS stdout example renders a centered text label and color regions in a 48 by 16 terminal canvas
• Diff whitespace checks pass

[tuist]

🛠️ Tuist Run Report 🛠️

Tests 🧪

Scheme	Status	Cache hit rate	Tests	Skipped	Ran	Commit
OpenSwiftUI	✅	0 %	1016	0	1016	bb810feab

Builds 🔨

Scheme	Status	Duration	Commit
OpenSwiftUI	✅	1m 13s	bb810feab

[codecov]

Codecov Report

❌ Patch coverage is 71.04478% with 97 lines in your changes missing coverage. Please review.
✅ Project coverage is 26.68%. Comparing base (f161632) to head (dffdbd6).

Files with missing lines	Patch %	Lines
...Render/DisplayList/DisplayListStdoutRenderer.swift	71.64%	93 Missing ⚠️
...e/Render/DisplayList/DisplayListViewRenderer.swift	0.00%	2 Missing ⚠️
...OpenSwiftUICore/Render/RendererConfiguration.swift	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #999      +/-   ##
==========================================
+ Coverage   26.19%   26.68%   +0.49%     
==========================================
  Files         736      736              
  Lines       55749    56081     +332     
==========================================
+ Hits        14606    14968     +362     
+ Misses      41143    41113      -30     

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