Fix case-insensitive remote URL matching for GitHub PRs

Normalizes the repository owner to lowercase during the PR
mapping.
This ensures that PR icons and integration features work correctly even
when the local git remote URL casing differs from the official
repository casing on GitHub.

pkg/commands/git_commands/github.go

@@ -283,7 +283,7 @@ func GenerateGithubPullRequestMap(
 	prByKey := map[prKey]models.GithubPullRequest{}
 
 	for _, pr := range prs {
-		key := prKey{owner: pr.UserName(), branchName: pr.BranchName()}
+		key := prKey{owner: strings.ToLower(pr.UserName()), branchName: pr.BranchName()}
 		// PRs are returned newest-first from the API, so the first one we
 		// see for each key is the most recent and therefore the most relevant.
 		if _, exists := prByKey[key]; !exists {
@@ -307,7 +307,7 @@ func GenerateGithubPullRequestMap(
 			owner = repoInfo.Owner
 		}
 
-		pr, hasPr := prByKey[prKey{owner: owner, branchName: branch.UpstreamBranch}]
+		pr, hasPr := prByKey[prKey{owner: strings.ToLower(owner), branchName: branch.UpstreamBranch}]
 
 		if !hasPr {
 			continue
@@ -348,7 +348,7 @@ func (self *GitHubCommands) InGithubRepo(remotes []*models.Remote) bool {
 	}
 
 	url := remote.Urls[0]
-	return strings.Contains(url, "github.com")
+	return strings.Contains(strings.ToLower(url), "github.com")
 }
 
 func getMainRemote(remotes []*models.Remote) *models.Remote {

pkg/commands/git_commands/github_test.go

@@ -318,6 +318,40 @@ func TestGenerateGithubPullRequestMap(t *testing.T) {
 				},
 			},
 		},
+		{
+			name: "matches when owner casing differs",
+			prs: []*models.GithubPullRequest{
+				{
+					HeadRefName:         "fix-case-insensitive",
+					Number:              42,
+					Title:               "Fix case insensitive",
+					State:               "OPEN",
+					HeadRepositoryOwner: models.GithubRepositoryOwner{Login: "Jesseduffield"}, // Uppercase J
+				},
+			},
+			branches: []*models.Branch{
+				{
+					Name:           "fix-case-insensitive",
+					UpstreamRemote: "origin",
+					UpstreamBranch: "fix-case-insensitive",
+				},
+			},
+			remotes: []*models.Remote{
+				{
+					Name: "origin",
+					Urls: []string{"git@github.com:jesseduffield/lazygit.git"}, // Lowercase j
+				},
+			},
+			expected: map[string]*models.GithubPullRequest{
+				"fix-case-insensitive": {
+					HeadRefName:         "fix-case-insensitive",
+					Number:              42,
+					Title:               "Fix case insensitive",
+					State:               "OPEN",
+					HeadRepositoryOwner: models.GithubRepositoryOwner{Login: "Jesseduffield"},
+				},
+			},
+		},
 	}
 
 	for _, c := range cases {