Fix sort-by, path join and size error arrows (#7199)

# Description
BEFORE:
```
〉ls | size
Error: nu:🐚:pipeline_mismatch (link)

  × Pipeline mismatch.
   ╭─[entry #22:1:1]
 1 │ ls | size
   ·      ──┬─
   ·        │╰── value originates from here
   ·        ╰── expected: string
   ╰────

〉ls | sort-by SIZE
Error: nu:🐚:column_not_found (link)

  × Cannot find column
   ╭─[entry #17:1:1]
 1 │ ls | sort-by SIZE
   ·      ───┬───
   ·         │╰── value originates here
   ·         ╰── cannot find column
   ╰────

〉[4kb] | path join 'b'
Error: nu:🐚:pipeline_mismatch (link)

  × Pipeline mismatch.
   ╭─[entry #6:1:1]
 1 │ [4kb] | path join 'b'
   · ──┬──
   ·   │╰── value originates from here
   ·   ╰── expected: string or record
   ╰────
```
AFTER:
```
〉ls | size
Error: nu:🐚:pipeline_mismatch (link)

  × Pipeline mismatch.
   ╭─[entry #1:1:1]
 1 │ ls | size
   · ─┬   ──┬─
   ·  │     ╰── expected: string
   ·  ╰── value originates from here
   ╰────

〉ls | get 0 | sort-by SIZE
Error: nu:🐚:column_not_found (link)

  × Cannot find column
   ╭─[entry #2:1:1]
 1 │ ls | get 0 | sort-by SIZE
   · ─┬           ───┬───
   ·  │              ╰── cannot find column 'SIZE'
   ·  ╰── value originates here
   ╰────

〉[4kb] | path join 'b'
Error: nu:🐚:pipeline_mismatch (link)

  × Pipeline mismatch.
   ╭─[entry #1:1:1]
 1 │ [4kb] | path join 'b'
   · ──┬──   ────┬────
   ·   │         ╰── expected: string or record
   ·   ╰── value originates from here
   ╰────

```

(Hey, anyone noticed that there's TWO wordings of "value originates from
here" in this codebase………?)

# User-Facing Changes

See above.

# Tests + Formatting

Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace --features=extra -- -D warnings -D
clippy::unwrap_used -A clippy::needless_collect` to check that you're
using the standard code style
- `cargo test --workspace --features=extra` to check that all tests pass

# After Submitting

If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.

crates/nu-command/src/strings/size.rs

@@ -162,11 +162,19 @@ fn size(
 ) -> Result<PipelineData, ShellError> {
     let span = call.head;
     input.map(
-        move |v| match v.as_string() {
-            Ok(s) => counter(&s, span),
-            Err(_) => Value::Error {
-                error: ShellError::PipelineMismatch("string".into(), span, span),
-            },
+        move |v| {
+            // First, obtain the span. If this fails, propagate the error that results.
+            let value_span = match v.span() {
+                Err(v) => return Value::Error { error: v },
+                Ok(v) => v,
+            };
+            // Now, check if it's a string.
+            match v.as_string() {
+                Ok(s) => counter(&s, span),
+                Err(_) => Value::Error {
+                    error: ShellError::PipelineMismatch("string".into(), span, value_span),
+                },
+            }
         },
         engine_state.ctrlc.clone(),
     )