Update grammar for Tree-sitter ABI 14 compatibility

[BernardIgiri]

🔁 Replaces #1

This updates the grammar to work with Tree-sitter ABI 14, which is required by Helix Editor 25 and other modern tooling.

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Why

I was trying to use this grammar in Helix, but encountered this error:

QueryError { message: "Incompatible language version 8. Expected minimum 13, maximum 14", kind: Language }

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What Changed

To resolve this, I:

• Re-initialized the grammar with tree-sitter init
• Regenerated the parser with tree-sitter generate --abi=14
• Split auto-generated files and manual grammar/test logic into separate commits to improve clarity and reviewability (per feedback on Update grammar for Tree-sitter ABI 14 compatibility #1)

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How I Verified

I added the grammar to Helix with the following config:

# languages.toml
[[grammar]]
name = "fluent"
source = { git = "https://github.com/BernardIgiri/tree-sitter-fluent.git", rev = "master" }

[[language]]
name = "fluent"
scope = "source.fluent"
file-types = ["ftl"]
comment-token = "#"

And used this highlights query file:

; Comments
(block_comment) @comment
(comment) @comment
(resource_comment) @comment

; Messages and terms
(message) @function
(term) @constant

; Identifiers
(identifier) @variable
(term_identifier) @constant

; Patterns (string content)
(pattern) @string

With this, Fluent .ftl files now display correctly in Helix 25.