Fix terminal path click failing when path is prefixed with '0:' (#50663)

The path hyperlink regex's middle-char pattern
[[:(][^0-9()]](cci:2://file:///d:/zed/crates/fs/src/fs.rs:89:0-157:1)
allowed colon+space because space was not in the exclusion set. This
caused `0: foo/bar.txt` to be matched as a single path instead of just
`foo/bar.txt`.

Fix: add space to the exclusion class: [[:(][^0-9()\\
]](cci:2://file:///d:/zed/crates/fs/src/fs.rs:89:0-157:1)

Closes #50531

- [x] Added a solid test coverage and/or screenshots from doing manual
testing
- [x] Done a self-review taking into account security and performance
aspects
- [ ] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
(N/A)

Release Notes:

- Fixed terminal Ctrl-click path detection failing when path is preceded
by a prefix like `0:` (#50531)

assets/settings/default.json

@@ -1831,8 +1831,8 @@
         "    (",
         "        # multi-char path: first char (not opening delimiter, space, or box drawing char)",
         "        [^({\\[<\"'`\\ \\u2500-\\u257F]",
-        "        # middle chars: non-space, and colon/paren only if not followed by digit/paren",
-        "        ([^\\ :(]|[:(][^0-9()])*",
+        "        # middle chars: non-space, and colon/paren only if not followed by digit/paren/space",
+        "        ([^\\ :(]|[:(][^0-9()\\ ])*",
         "        # last char: not closing delimiter or colon",
         "        [^()}\\]>\"'`.,;:\\ ]",
         "    |",

crates/terminal/src/terminal_hyperlinks.rs

@@ -905,6 +905,18 @@ mod tests {
                 );
             }
 
+            #[test]
+            // <https://github.com/zed-industries/zed/issues/50531>
+            fn issue_50531() {
+                // Paths preceded by "N:" prefix (e.g. grep output line numbers)
+                // should still be clickable
+                test_path!("0: ‹«foo/👉bar.txt»›");
+                test_path!("0: ‹«👉foo/bar.txt»›");
+                test_path!("42: ‹«👉foo/bar.txt»›");
+                test_path!("1: ‹«/👉test/cool.rs»›");
+                test_path!("1: ‹«/👉test/cool.rs»:«4»:«2»›");
+            }
+
             #[test]
             // <https://github.com/zed-industries/zed/issues/46795>
             fn issue_46795() {