chore(commands): more commands for suggestions (#10)

## What's new
- color completion message command green
https://github.com/versenilvis/IRIS/pull/10/commits/6e141f5e6909fad1ec42725cce38d51729acf399
- new flat command folder structure
https://github.com/versenilvis/IRIS/pull/10/commits/87026a854a529ec5d5baed967d5f7a7f0085a24b
- fix some linter problems
https://github.com/versenilvis/IRIS/pull/10/commits/536de790cefda912f50bf4022e40ce2b965db2e2
- fix some gemini fix suggestions

integration/history.go

@@ -107,6 +107,9 @@ func SearchHistory(query string) ([]HistResult, error) {
 				allCmds = append(allCmds, cmd)
 			}
 		}
+		if err := scanner.Err(); err != nil {
+			return nil, err
+		}
 
 		// build historyCache backwards so newest commands come first
 		seen := make(map[string]bool)

integration/overlay.go

@@ -99,7 +99,9 @@ func (o *Overlay) RenderGhostText(buffer string, userNavigated bool) string {
 	if ghostText != "" || padLen > 0 {
 		s.WriteString("\0337") // SAVE CURSOR at prompt
 		if ghostText != "" {
-			s.WriteString("\033[90m" + ghostText + "\033[0m")
+			s.WriteString("\033[90m")
+			s.WriteString(ghostText)
+			s.WriteString("\033[0m")
 		}
 		if padLen > 0 {
 			s.WriteString(strings.Repeat(" ", padLen))