fix(codegen): cast replaced expressions to the expected type

[volsa]

Problem: Codegen stores the result of an expression the resolver replaced (the builtins ADD, SUB, MUL, DIV, date and time operators, string comparisons) without converting it to the type of the target. x := t * 1.5 with an LREAL x writes the TIME bits into the double and reads 0.0, n := ADD(n, r) stores float bits into a DINT, and (tod + T#20s) in parentheses skips the replacement and does not wrap at midnight. With #1937, the builtin forms such as MUL(t, 1.5) would hit the same path.

Solution: Generate the replacement where every expression value is generated. The replaced node already has the type of its replacement, so its value takes the same conversion to its hint as any other value, also inside parentheses.

🤖 Generated with Claude Code

[github-actions]

Build Artifacts

🐧 Linux

Artifact	Link	Size
plc-aarch64	Download	43.4 MB
deb-x86_64	Download	38.5 MB
plc-x86_64	Download	43.6 MB
stdlib	Download	32.4 MB
deb-aarch64	Download	30.9 MB
schema	Download	0.0 MB

From workflow run

🪟 Windows

Artifact	Link	Size
plc.exe	Download	38.4 MB
stdlib.lib	Download	4.0 MB
stdlib.dll	Download	0.1 MB

From workflow run

[volsa]

Closing in favor of carrying this fix in #1937, which routes the date and time builtins through the same replacement path.