fix(swift-ios): remove composer line cap

[saphid]

What

Removes the numeric seven-line composer cap while keeping very tall drafts bounded by the available viewport.

Scope

One extracted feature commit touching only FeatureComposerView and FeatureComposerPowerTests.

Verification

• FeatureComposerPowerTests: 10 tests passed
• Exact extracted head compiled in the focused native test run
• Visual proof: composer-growth.mp4

Dependencies and gate

• The base provider-catalog fixture failure is repaired separately in test(swift-ios): use environment-scoped provider catalogs #6130
• Draft pending maintainer direction

Note

Remove 7-line cap from iOS chat composer text input

• Replaces .lineLimit(1...7) on the composer TextField with a new FeatureComposerGrowingTextInput view modifier that applies an unbounded .lineLimit(1...) and raises .layoutPriority(1).
• The text input now grows with content up to the container bounds rather than stopping at 7 lines.
• Adds two @MainActor tests in FeatureComposerPowerTests.swift verifying growth beyond 3 lines and respect for viewport height limits.

^{Macroscope summarized c687717.}

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