test(tools): add unit tests for error handling functions

* Implement tests for error functions like errRequiredField, errInvalidField, and errEntityNotFound.
* Ensure proper metadata is returned for various error scenarios.
* Validate error handling in CRM, Files, and other tools.
* Introduce tests for parsing stored file IDs and UUIDs.
* Enhance coverage for helper functions related to project resolution and session management.

internal/buildinfo/buildinfo.go

@@ -0,0 +1,41 @@
+package buildinfo
+
+import "strings"
+
+var (
+	Version   = "dev"
+	TagName   = "dev"
+	Commit    = "unknown"
+	BuildDate = "unknown"
+)
+
+type Info struct {
+	Version   string `json:"version"`
+	TagName   string `json:"tag_name"`
+	Commit    string `json:"commit"`
+	BuildDate string `json:"build_date"`
+}
+
+func Current() Info {
+	info := Info{
+		Version:   strings.TrimSpace(Version),
+		TagName:   strings.TrimSpace(TagName),
+		Commit:    strings.TrimSpace(Commit),
+		BuildDate: strings.TrimSpace(BuildDate),
+	}
+
+	if info.Version == "" {
+		info.Version = "dev"
+	}
+	if info.TagName == "" {
+		info.TagName = info.Version
+	}
+	if info.Commit == "" {
+		info.Commit = "unknown"
+	}
+	if info.BuildDate == "" {
+		info.BuildDate = "unknown"
+	}
+
+	return info
+}