test(ui): color-matrix for the home-screen render surface

[LukasWodka]

The ui color-matrix harness from the coverage audit. ui was the lowest own-coverage package (62%) — the merged profile hid it because internal/cli tests hit the render helpers transitively while asserting only plain substrings, never the glyph or the color. Now pinned in both color modes:

• CheckLine / CrossLine / WarnLine / Errorf / MenuRow / Infof / PromptHeader / PromptHint (all 0% own): glyph + text render, and ANSI escapes appear iff color is on.
• Para multi-line indent branch (0% own).

ui own-coverage 62% → 74.7%. No production changes.

🤖 Generated with Claude Code

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Note

Low Risk
Test-only additions with no runtime or behavioral changes to the UI package.

Overview
Adds internal/ui/color_matrix_test.go to raise own coverage for Printer helpers that were only exercised indirectly from internal/cli tests (glyphs and ANSI were never asserted).

TestPrinter_ColorMatrix table-tests CheckLine, CrossLine, WarnLine, Errorf, MenuRow, Infof, PromptHeader, and PromptHint in plain and colored modes: required glyphs/text must appear, and ANSI escapes (via shared esc from ui_test.go) must appear only when WithColor(true).

TestPrinter_ParaMultiline locks the multi-line Para branch so each line gets a two-space indent.

No production code changes; tests only.

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[LukasWodka]

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[saadqbal]

LGTM 👍 Good call testing the glyph + the color escapes directly rather than the plain substrings the cli-layer tests settle for — verified every case paints with ≥1 attr so the colored-mode ANSI assertion holds, incl. PromptHeader/PromptHint.