fix: render NomadNet six-digit true colors

[torlando-tech]

Summary

• parse six-digit Micron foreground and background colors emitted by NomadNet
• consume complete true-color control sequences instead of leaking fragments into rendered text
• add parser regressions and a Compose rendering regression
• select the physical rendering regression in the existing CI emulator lane

Verification

• Micron unit suite
• Micron and app ktlint/detekt
• Kotlin instrumentation APK assembly
• physical Galaxy S21 Ultra true-color rendering regression

Risk and rollback

The parser change is limited to six-digit color controls while preserving existing short color behavior. Reverting this PR restores the previous parser and removes the added CI test selection.

[greptile-apps]

Greptile Summary

The PR adds six-digit RGB support specifically for inline Micron FT and BT controls while preserving existing page-directive and short-color behavior.

• Introduces a dedicated true-color parser used only by inline formatting commands.
• Consumes complete true-color control payloads so command fragments do not appear as rendered text.
• Adds parser and Compose rendering regressions and selects the device test in CI.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
micron/src/main/java/network/columba/app/micron/MicronColor.kt	Separates six-digit inline true-color parsing from the shared three-character parser, resolving the previously reported directive-scope expansion.
micron/src/main/java/network/columba/app/micron/MicronParser.kt	Recognizes FT and BT controls, parses six hexadecimal digits, and advances past the entire valid sequence.
micron/src/test/java/network/columba/app/micron/MicronParserTest.kt	Covers valid, malformed, and truncated true-color controls and confirms page directives continue rejecting six-digit values.
app/src/androidTestDebug/java/network/columba/app/ui/components/MicronTrueColorRenderingTest.kt	Adds an end-to-end Compose regression checking rendered text and the expected true-color background.
.github/workflows/ci.yml	Adds the true-color rendering regression to the existing connected-device test selection.

_{Reviews (3): Last reviewed commit: "test malformed micron true colors" | Re-trigger Greptile}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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