fix: refine theme path matching and enhance theme suggestion logic

[dermatz]

This pull request improves the accuracy and robustness of theme code matching and theme suggestions. The main changes include stricter matching logic in ThemePath, better handling of empty input, and more consistent, case-insensitive comparison in the theme suggestion logic.

Theme path resolution improvements:

• The getPath method in ThemePath.php now only returns a path if the theme code matches exactly with either 'frontend/' . $themeCode or 'adminhtml/' . $themeCode, instead of using a substring match. This prevents accidental partial matches and ensures more precise theme resolution.

Theme suggestion robustness and accuracy:

• The findSimilarThemes method in ThemeSuggester.php now immediately returns an empty array if the input theme name is empty, preventing unnecessary processing and possible errors.
• Theme code comparisons in findSimilarThemes are now performed in a case-insensitive manner for both Levenshtein distance and substring checks, improving the quality and user-friendliness of suggestions.

Code cleanup:

• Removed redundant constructor docblock comments in ThemeSuggester.php for improved code clarity.

[Copilot]

Pull request overview

This PR tightens Magento theme resolution and improves CLI theme suggestions by avoiding partial theme-code matches and making suggestion matching more robust and case-insensitive.

Changes:

• Refined ThemePath::getPath() to only match exact frontend/<themeCode> or adminhtml/<themeCode> registrations (no substring matches).
• Improved ThemeSuggester::findSimilarThemes() to early-return on empty input and compare theme codes case-insensitively for both Levenshtein and substring matching.
• Removed redundant constructor docblock noise in ThemeSuggester.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/Service/ThemeSuggester.php	Makes theme suggestions safer (empty input) and more user-friendly (case-insensitive matching).
src/Model/ThemePath.php	Prevents accidental partial matches by requiring exact theme registration key matches.

Comments suppressed due to low confidence (1)

src/Service/ThemeSuggester.php:53

• strtolower($invalidTheme) and strtolower($themeCode) are recomputed multiple times per iteration (for both levenshtein and str_contains). Consider precomputing the lowercased input once before the loop, and lowercasing $themeCode once per iteration, to reduce repeated work and keep the matching logic easier to read.

        $themes = $this->themeList->getAllThemes();
        $threshold = (int) (strlen($invalidTheme) / 3);
        $suggestions = [];

        foreach ($themes as $theme) {
            $themeCode = $theme->getCode();
            $distance = levenshtein(strtolower($invalidTheme), strtolower($themeCode));

            // Accept if: distance ≤ 1/3 of input length OR substring match (case-insensitive)
            if ($distance <= $threshold || str_contains(strtolower($themeCode), strtolower($invalidTheme))) {
                $suggestions[$themeCode] = $distance;