feat: implement real-name to username auto-derivation, add root privilege check, and improve manual partitioning UI with smart defaults.

locales/en.toml

@@ -45,6 +45,7 @@ erase_warning          = "WARNING: All data on the selected disk will be erased"
 users                   = "Users"
 users_title             = "User Account"
 users_description       = "Create a user account for your system."
+real_name_label         = "Full Name"
 username_label          = "Username"
 password_label          = "Password"
 password_confirm_label  = "Confirm password"
@@ -154,6 +155,10 @@ pwd_very_strong = "Very strong"
 use_same_for_admin = "Use the same password for the administrator (root) account"
 
 # ── Checker ───────────────────────────────────────────────
+check_root        = "Permissions"
+check_root_pass   = "Running with root privileges."
+check_root_fail   = "Not running as root! The installer requires root privileges. Please run with 'sudo yali-rs' or 'pkexec yali-rs'."
+
 check_disk_space = "Disk Space"
 check_disk_fail  = "Maximum disk size is %{size} GB. Minimum 10 GB is required for installation."
 check_disk_warn  = "%{size} GB disk available. 20 GB or more recommended."
@@ -248,6 +253,7 @@ mp_error_empty_mountpoint = "Mount point cannot be empty."
 mp_plan_valid = "✓  Partition plan is valid. You can proceed."
 mp_select_disk_first = "← Select a disk first."
 mp_add_dialog_hint = "/ or /home or swap"
+mp_select_hint = "Select…"
 mp_add_btn = "✓ Add"
 mp_size_hint = "Size (MB, 0=remaining):"
 mp_delete_confirm_yes = "✓ Yes, Delete"