Fix cmd-click opening of relative/local paths (#9921)

This PR fixes an issue #9563 where relative file paths were not being
resolved against the terminal’s current working directory before
opening.


#### Verification
Tested with directories containing:
```
/tmp/test/test
❯ du -h .
  0B    ./spaces-end
  0B    ./with dot.
  0B    ./space middle
8.0K    .
```

Parent directory resolution also works as expected:
```
/tmp/test/test
❯ du -h ..
  0B    ../test/spaces-end
  0B    ../test/with dot.
  0B    ../test/space middle
8.0K    ../test
 16K    ..
 ```
 
@mitchellh  
In your original description you mentioned that “Links should work for all situations as they do in iTerm2.”  
I noticed that, for example, when running `ls`, the paths are not clickable, while they are clickable in iTerm2.
If you think this case should also be handled, I can open a separate PR for it once this one is accepted.

src/Surface.zig

@@ -2037,6 +2037,23 @@ pub fn pwd(
     return try alloc.dupe(u8, terminal_pwd);
 }
 
+/// Resolves a relative file path to an absolute path using the terminal's pwd.
+fn resolvePathForOpening(
+    self: *Surface,
+    path: []const u8,
+) Allocator.Error!?[]const u8 {
+    if (!std.fs.path.isAbsolute(path)) {
+        const terminal_pwd = self.io.terminal.getPwd() orelse {
+            return null;
+        };
+
+        const resolved = try std.fs.path.resolve(self.alloc, &.{ terminal_pwd, path });
+        return resolved;
+    }
+
+    return null;
+}
+
 /// Returns the x/y coordinate of where the IME (Input Method Editor)
 /// keyboard should be rendered.
 pub fn imePoint(self: *const Surface) apprt.IMEPos {
@@ -4265,7 +4282,12 @@ fn processLinks(self: *Surface, pos: apprt.CursorPos) !bool {
                 .trim = false,
             });
             defer self.alloc.free(str);
-            try self.openUrl(.{ .kind = .unknown, .url = str });
+
+            const resolved_path = try self.resolvePathForOpening(str);
+            defer if (resolved_path) |p| self.alloc.free(p);
+
+            const url_to_open = resolved_path orelse str;
+            try self.openUrl(.{ .kind = .unknown, .url = url_to_open });
         },
 
         ._open_osc8 => {

src/config/url.zig

@@ -26,7 +26,7 @@ pub const regex =
     "(?:" ++ url_schemes ++
     \\)(?:
     ++ ipv6_url_pattern ++
-    \\|[\w\-.~:/?#@!$&*+,;=%]+(?:[\(\[]\w*[\)\]])?)+(?<![,.])|(?:\.\.\/|\.\/|\/)[\w\-.~:\/?#@!$&*+,;=%]+(?:\/[\w\-.~:\/?#@!$&*+,;=%]*)*
+    \\|[\w\-.~:/?#@!$&*+,;=%]+(?:[\(\[]\w*[\)\]])?)+(?<![,.])|(?:\.\.\/|\.\/|\/)(?:(?=[\w\-.~:\/?#@!$&*+,;=%]*\.)[\w\-.~:\/?#@!$&*+,;=%]+(?: [\w\-.~:\/?#@!$&*+,;=%]*[\/.])*(?: +(?= *$))?|(?![\w\-.~:\/?#@!$&*+,;=%]*\.)[\w\-.~:\/?#@!$&*+,;=%]+(?: [\w\-.~:\/?#@!$&*+,;=%]+)*(?: +(?= *$))?)
     ;
 const url_schemes =
     \\https?://|mailto:|ftp://|file:|ssh:|git://|ssh://|tel:|magnet:|ipfs://|ipns://|gemini://|gopher://|news:
@@ -253,6 +253,23 @@ test "url regex" {
             .input = "IPv6 in markdown [link](http://[2001:db8::1]/docs)",
             .expect = "http://[2001:db8::1]/docs",
         },
+        // File paths with spaces
+        .{
+            .input = "./spaces-end.   ",
+            .expect = "./spaces-end.   ",
+        },
+        .{
+            .input = "./space middle",
+            .expect = "./space middle",
+        },
+        .{
+            .input = "../test folder/file.txt",
+            .expect = "../test folder/file.txt",
+        },
+        .{
+            .input = "/tmp/test folder/file.txt",
+            .expect = "/tmp/test folder/file.txt",
+        },
     };
 
     for (cases) |case| {