motd/20-ip-info: align (LAN)/(WAN) labels across IPv4 + IPv6 rows

The IPv4 row used a 14-char prefix (` IPv4:` + 8 trailing spaces);
the IPv6 row used 15 (` IPv6:` + 9 trailing spaces). The extra
space on v6 was an attempt to make the v6 address column line up
with the v4 address column when v4 had a `(LAN)` label and v6
didn't (v6's LAN appendix had no label at all, just the bare
address). Worked when v4 had `(LAN)` and v6 had something — broke
the moment LAN got dropped against WAN by the dedup at lines
76-81 and only the `(WAN)` half remained.

Net visible bug (addresses are RFC 5737 / RFC 3849 examples):

   IPv4:        (WAN) 192.0.2.42
   IPv6:         (WAN) 2001:db8::42
                ^ shifted by one column

Fix:

  - Use the same 13-char prefix for both rows (IPv4: / IPv6: + 7
    padding, no trailing space).
  - Both `(LAN)` and `(WAN)` appendices start with a single
    leading space — the label always sits at the same column
    regardless of which (or both) are present.
  - Add a `(LAN)` label to v6 too; the asymmetry was the original
    reason the spacing was offset, and removing it lets v4 and v6
    structurally mirror each other.
  - Drop the trailing space the appendices used to carry — pure
    EOL whitespace, never visible.

Verified across all four cases (LAN+WAN / LAN only / WAN only /
nothing): `(LAN)` and `(WAN)` always align column-for-column on
both rows.

Author: igorpecovnik

packages/bsp/common/etc/update-motd.d/20-ip-info

@@ -80,21 +80,32 @@ print_ip_lines() {
     ipv6s="$(printf '%s\n' $ipv6s | awk -v w="$wan6" '$0!=w' | paste -sd' ' -)"
   fi
 
+  # Both lines use the SAME prefix width and BOTH (LAN) and (WAN)
+  # appendices start with a single leading space — that way the
+  # labels always sit at the same column regardless of whether
+  # one or both are present, and the v6 line stays aligned under
+  # the v4 line. Previously the v6 prefix was 1 space wider and
+  # v6 had no (LAN) label at all, so removing one half (the
+  # common case is LAN deduped against WAN by the block above)
+  # produced misaligned (WAN) labels across the two rows.
+  local prefix4=" IPv4:       "
+  local prefix6=" IPv6:       "
+
   # IPv4 line
   if [[ -n "$ipv4s" || -n "$wan4" ]]; then
     _motd_mark_after_header
-    local line=" IPv4:        "
-    [[ -n "$ipv4s" ]] && line+=" \x1B[93m(LAN)\x1B[0m \x1B[92m${ipv4s// /, }\x1B[0m "
-    [[ -n "$wan4"  ]] && line+="\x1B[93m(WAN)\x1B[0m \x1B[95m${wan4}\x1B[0m "
+    local line="$prefix4"
+    [[ -n "$ipv4s" ]] && line+=" \x1B[93m(LAN)\x1B[0m \x1B[92m${ipv4s// /, }\x1B[0m"
+    [[ -n "$wan4"  ]] && line+=" \x1B[93m(WAN)\x1B[0m \x1B[95m${wan4}\x1B[0m"
     printf '%b\n' "$line"
   fi
 
   # IPv6 line
   if [[ -n "$ipv6s" || -n "$wan6" ]]; then
-    _motd_mark_after_header    
-    local line=" IPv6:         "
-    [[ -n "$ipv6s" ]] && line+="\x1B[96m${ipv6s// /, }\x1B[0m "
-    [[ -n "$wan6"  ]] && line+="\x1B[93m(WAN)\x1B[0m \x1B[95m${wan6}\x1B[0m "
+    _motd_mark_after_header
+    local line="$prefix6"
+    [[ -n "$ipv6s" ]] && line+=" \x1B[93m(LAN)\x1B[0m \x1B[96m${ipv6s// /, }\x1B[0m"
+    [[ -n "$wan6"  ]] && line+=" \x1B[93m(WAN)\x1B[0m \x1B[95m${wan6}\x1B[0m"
     printf '%b\n' "$line"
   fi
 }