[glenntosco]

Requested by Glenn · project thread

What changed and why

Assessment item 13. Stacks on the pt-BR/fr-CA PR (→ #7 → #6 → #5). Merge in order.

The Preview window now shows a label the way the printer puts it on the media when it is set to print upside down (^POI) or mirrored (^PMY). It opens on "As printed", says in one sentence why the picture is turned, and has an "As designed" switch. The design canvas stays upright for editing; the status bar names the difference ("Prints upside down" / "Prints mirrored").

• Rendering: RenderLabel.Inverted / Mirrored flip the whole drawing about the label centre in LabelRenderer.Draw. Only LabelDocumentAdapter.AsPrinted sets them; ToRenderLabel stays upright.
• App: new PreviewViewModel (switch, note, redraw event), PreviewCache.RenderPrinted(..., asPrinted), switch row shown only for ^POI / ^PMY labels, status-bar badge.
• Exports (PNG/JPEG/PDF) and the MCP preview stay as designed: exports are artwork, not a picture of the printer's output (written up in docs/decisions.md).
• ^PM was already modelled (MirrorImage), so it is previewed the same way. Import of ^POI / ^PON / ^PMY already worked; now covered by tests.
• Command catalogue: ^PO / ^PM preview set to Exact; docs/zpl-coverage.md regenerated.
• 14 strings in en, es, pt-BR and fr-CA; CHANGELOG, README (en/es), decisions.

How it was tested

• PrintOrientationPreviewTests: pixel-for-pixel 180° turn, mirror and both; block position at scale 1 and 2; adapter only flips through AsPrinted; PNG export stays upright; import of ^POI, ^POi, ^PON, none; inverted + mirrored round trip; new golden label_print_inverted.zpl.
• PreviewViewModelTests: defaults, redraw and change notifications, note text for each case, radio write-back of false does not flip the choice, bitmap bounds, no switch for a normal label, status badge, canvas stays upright.
• Solution builds with 0 warnings; Core/Rendering cases also ran in a Linux scratch harness. App tests run on Windows CI.

Checklist

• Build passes; tests run on Windows CI
• New behavior has tests (golden file added)
• New text in all four resx files
• No network calls or telemetry; light theme only
• No new dependencies
• CHANGELOG.md updated
• Hygiene check passes

Notes

• The canvas is deliberately never rotated; editing an upside-down label would be confusing.
• The WPF layout of the switch row and badge has not been seen on screen yet.

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