Add code fix for double literal without dot

[amcasey]

It's very easy to write 2 when you mean 2.. Offer a code fix.

[amcasey]

I don't really care whether we merge this. I make this mistake pretty regularly in Q#, but I mostly implemented it to practice writing rust without copilot.

With all the time in the world, I'd probably experiment with having type inference infer either Int or Double for integer literals, depending on the context. In such a world, we might want a suffix to force the literal to Int, but the only place I can think of where both are allowed and the difference matters is division.

[amcasey]

When we switched from one edit to two, the updated test became less meaningful as confirmation that the action was behaving correctly, so now we check the locations of the edits too.

[Copilot]

Pull request overview

Adds a new Q# language service code action that offers a quick fix when an integer literal is used where a Double is expected, by inserting a trailing . (e.g., 2 → 2.). This fits into the existing source/language_service/src/code_action/ quick-fix providers alongside existing fixes like “wrap in array”.

Changes:

• Add int_to_double code action provider and wire it into get_code_actions.
• Add a new test suite for the int-to-double quick fix (including unary +/-, parens cases).
• Strengthen existing “wrap in array” tests by asserting edit ranges against marker-derived expected locations.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
source/language_service/src/code_action/wrap_in_array/tests.rs	Updates tests to use marker-derived Locations and assert edit ranges precisely.
source/language_service/src/code_action/int_to_double/tests.rs	New tests validating the “Convert to double literal” code action behavior across several expression shapes.
source/language_service/src/code_action/int_to_double.rs	New quick-fix implementation that inserts a trailing . for Int literal mismatches against expected Double.
source/language_service/src/code_action.rs	Registers the new int_to_double provider in the code actions pipeline.