Fix magproj docs/code mismatch and integrate magMWdust from PR #19

[Copilot]

PR #19 added a lab.cex=1 parameter to magproj() but omitted it from man/magproj.Rd, causing R CMD check to fail with a codoc WARNING. This also incorporates the full feature set from PR #19.

Changes

Documentation fix (root cause of CI failure)

• man/magproj.Rd — Added lab.cex = 1 to \usage{} and a new \item{lab.cex} entry in \arguments{}

magproj() code changes (from PR #19)

• R/magproj.R — Added lab.cex=1 parameter; passes it as cex to all internal text() label calls; replaced the naive lat= (lat+90) %% 180 - 90 wrap with a proper .lat_wrap() helper that correctly handles polar boundary cases

New magMWdust function (from PR #19)

• R/magMWdust.R — Plots SFD MW dust as projected points or polygons, with opacity scaled via magmap(); includes utils::globalVariables("SFD_dust") to suppress the NOTE for the lazy-loaded dataset
• man/magMWdust.Rd — Full documentation for magMWdust and the SFD_dust dataset alias
• data/SFD_dust.rda — 1×1 deg equatorial-grid SFD dust lookup table (~295 KB)

Package metadata

• DESCRIPTION — Added LazyData: true to enable lazy-loading of SFD_dust
• NAMESPACE — Added setTxtProgressBar and txtProgressBar to utils imports

[Copilot]

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[asgr]

Note to fix some issues copilot had to copy across the original pull request from @AngusWright. I was a bit confused by this, but I think the issue is it could only make direct edits to pull requests launched by me or it. I've been sure to leave the relevant credit in the magMWdust files though.