T8587: address review feedback for u64 type support

- cli_def.l: reject out-of-range integer literals (errno==ERANGE) as a
  syntax error instead of silently classifying them as u32.

- cli_new.c (val_cmp): unify u32/u64 comparison through strtoull() with
  errno/end-pointer validation so unparseable operands are skipped
  instead of silently compared as 0, and so mixed u32/u64 operands are
  evaluated correctly via the 64-bit path.

- cli_new.c (cond_formats/cond_format_lens): replace the unused
  INT64_TYPE entries with NULL/0 sentinels and a comment, since
  INT64_TYPE is handled via its own branch in val_cmp(); this removes
  a latent foot-gun where '%llu' would write 8 bytes into a 4-byte
  unsigned int slot of left_parts[] if a future refactor routed
  INT64_TYPE through the generic path.

- cli_new.c: introduce type compatibility helpers and apply them so
  that a u32-magnitude value is accepted in a u64 (INT64_TYPE) context
  (validate_value, char2val_notext) and so that comparisons between
  u32 and u64 operands proceed (check_comp, val_cmp). The reverse
  direction (u64-magnitude value into a u32 field) remains rejected to
  preserve u32 range enforcement.

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