[DText] Implement capitalization handling for all ID links

[Undisguised-Art]

Problem Statement

The current DText implementation does not offer users control over capitalization in ID links. This limitation forces users to use workarounds, which is frustration for those who prefer correct capitalization in their content.

Examples of the current behavior

DText	Result	Expected
Post #1234	post #1234	Post #1234
ArtStation #1234	artstation #1234	ArtStation #1234
bur #1234	BUR# 1234	BUR# 1234

It makes sense that the abbreviation of "bulk update request" is always capitalized, but what about the rest?

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Current Workarounds

While it is possible to workaround the issue by using one of the other full-length link formats, this requires additional effort and is not conducive to maintaining style consistency for these links. Additionally, it is worth noting that external ID links are not decorated with external link icon. I am not sure if that is a feature or an oversight, but it does mean the workaround is not capable of providing identical results.

Link Decoration Differences

DText	Result
artstation #1234	artstation #1234
"artstation #1234":https://www.artstation.com/artwork/1234	artstation #1234

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Solution Proposal

Given that ID links are a shorthand format for convenience, I do not think it is necessary to support arbitrary capitalization. Supporting arbitrary capitalization could cause two main issues:

• It would allow capitalization typos to be inadvertently passed to the output, which is particularly undesirable since backwards compatibility is a goal.
• It would require users to remember and use correct capitalization style for proper nouns (e.g., Artstation vs. ArtStation), which reduces the overall convenience of using these links.

Instead, I suggest allowing capitalization that matches a few common styles: four options for common nouns and two for proper nouns.

Link Specifier Type	Input Capitalization	Output Capitalization
Common Nouns	Sentence case	Sentence case
	Capitalize each word	Capitalize each word
	All uppercase	All uppercase
	All lowercase	All lowercase
	Any other case	All lowercase
Proper Nouns	All uppercase	All uppercase
	Any other case	Correct capitalization for the proper noun