Consolidate duplicate path encoding functions

[Fuabioo]

Problem

There are two path encoding functions with different behavior:

1. internal/config/config.go:172-186 - encodeProjectPath
2. internal/history/paths.go:22-34 - EncodeProjectPath

Evidence

config.go version:

func encodeProjectPath(path string) string {
    result := ""
    for _, c := range path {
        if c == filepath.Separator {
            result += "-"
        } else if c == ':' {
            continue  // Skip Windows colon
        } else {
            result += string(c)  // KEEPS DOTS
        }
    }
    return result
}

paths.go version:

func EncodeProjectPath(path string) string {
    encoded := strings.ReplaceAll(path, string(filepath.Separator), "-")
    encoded = strings.ReplaceAll(encoded, ".", "-")  // REPLACES DOTS
    // ...
}

The key difference: history.EncodeProjectPath replaces dots with dashes, while config.encodeProjectPath preserves dots.

Impact

This inconsistency could cause path mismatches if both functions are used in different parts of the codebase with the expectation of matching results.

Suggested Fix

1. Delete the private config.encodeProjectPath function
2. Use the public history.EncodeProjectPath everywhere
3. The history package version should be canonical since it's the public API

Files:

• internal/config/config.go:172-186
• internal/history/paths.go:22-34