test(installer): cover the compact header

[NovusEdge]

The banner collapse from #95 had no test. This adds two.

TestViewTradesTheBannerForHeight pins the rule: a 60-row terminal keeps the
six-line mark, a 10-row terminal trades it for the one-line label, and the
check transcript survives the trade. Breaking the height condition in View
makes it fail, so it holds the behaviour rather than the current output.

TestViewDrawsTheBannerOnce pins that no phase renders the mark's top row
twice.

Two reported defects, both closed as capture artifacts

A visual pass reported a duplicated banner row on the build transition and two
literal tab characters in the ssh row of the check table, both seen through
tmux capture-pane.

Neither is in the rendered output. m.checkTable() contains no tab character
for the same check set, and m.View().Content contains the banner's top row
once in every phase. A pane capture taken mid-redraw shows a partial frame,
which accounts for the duplicate; the tabs come from the capture path.

The second test is the standing guard for the banner half of that.

[coderabbitai]

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Reviewing files that changed from the base of the PR and between 47ec90e and ad170b8.

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• internal/installer/tui_test.go

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