TwoSampleMR 0.7.7

[remlapmot]

• Remove dead exposure_mat assignment
• Replace reshape2::dcast() with tidyr::pivot_wider()
• Replace deprecated ggplot2::aes_string() with ggplot2::aes()
• Add new bare names to globalVariables()
• Replace deprecated size with linewidth in geom_vline(), geom_errorbarh(), geom_errorbar(), and element_rect()
• Fix constant-in-aes, redundant sapply, and paste/paste0
• Qualify predict() and desc() calls; remove from globalVariables()
• Remove broken and unreachable mr_mode_broken() function and its globalVariables() entry
• Replace sapply with invisible(lapply()) for side-effect iteration; use paste0() for single leading space
• Replace 1:n index patterns with seq_len() in chunking logic
• Hoist paste() out of inner loop; replace nested loops with single vectorised assignment
• Make startup message URLs clickable via cli::style_hyperlink(); add cli to Imports