fix(git): review follow-ups for #1357 (S1, S2, indent)

S1: get_gitea_login_for_repo_override() now distinguishes "tea is not
installed" from "no tea login named X exists", mirroring the host path.
The old message diagnosed a cause that was never checked and pointed at
seat-logins.sh, which cannot run without tea. Branch 6 in
test-gitea-login-resolution.sh pins it (tea removed from PATH); reverting
the fix fails that branch.

S2: issue-list/pr-list/pr-view override-path error now points at the
lines above for the cause instead of suggesting a default tea login.

verify-release.mjs: indent of the #1356 test line fixed (cosmetic).

scripts/verify-release.mjs

@@ -61,7 +61,7 @@ export const STAGES = [
       'bash packages/mosaic/framework/tools/quality/scripts/check-tools-index.sh --self-test',
       'bash packages/mosaic/framework/tools/quality/scripts/check-tools-index.sh',
       'bash packages/mosaic/framework/tools/git/test-issue-close-fail-closed.sh',
-        'bash packages/mosaic/framework/tools/git/test-gitea-login-resolution.sh',
+      'bash packages/mosaic/framework/tools/git/test-gitea-login-resolution.sh',
       'bash packages/mosaic/framework/tools/git/test-issue-view-comments.sh',
       'bash packages/mosaic/framework/tools/git/test-wrapper-guard.sh',
       'bash packages/mosaic/framework/tools/git/test-mosaic-worktree-large-repo.sh',