Implement issue #58: text styling + TextField config

[jonathanpeppers]

Closes #58 (the bulk of it — see Deferred at the bottom for the remainder).

What ships

New Text properties

Color, FontStyle, FontFamily, Align, Overflow, SoftWrap, MaxLines, MinLines.

new Text("Italic serif red, centered")
{
    Color      = ColorKt.Color(0xC6, 0x28, 0x28, 0xFF),
    FontStyle  = FontStyle.Italic,
    FontFamily = FontFamily.Serif,
    Align      = TextAlign.Center,
    Modifier   = Modifier.Companion.FillMaxWidth(),
}

new Text("This long line clips with an ellipsis…")
{
    MaxLines = 1,
    Overflow = TextOverflow.Ellipsis,
    SoftWrap = false,
}

New TextField / OutlinedTextField slots

Enabled, ReadOnly, Label, Placeholder, LeadingIcon, TrailingIcon, Prefix, Suffix, SupportingText, IsError, SingleLine, MaxLines, MinLines.

new TextField(name)
{
    Label          = new Text("Your name"),
    Placeholder    = new Text("Type something…"),
    LeadingIcon    = new Text("👤"),
    TrailingIcon   = new Text("✎"),
    SupportingText = new Text("Powered by issue #58 slots"),
    SingleLine     = true,
}

Generator changes

ComposeBridgeGenerator and ComposeFacadeGenerator now recognize nullable primitives (bool?, int?, long?, float?, double?). At the bridge level these lower to (name ?? defaultLiteral) so a null clears the corresponding $default bit and Kotlin's default runs; at the facade level they surface as nullable auto-properties — parity with existing nullable Compose value types like Dp? / Sp?. Three tests cover the new behaviour (one bridge, one facade, one mixed).

New wrapper types

Type	Lowering	Why
FontStyle	reference (slot L)	@JvmInline value class but Compose declares fontStyle: nullable, which boxes
FontFamily	reference (slot L)	regular Kotlin class, just not bound yet
TextOverflow	packed int (slot I)	@JvmInline value class, declared non-nullable in Compose
TextAlign	reference (slot L) — breaking change, was a value struct	same boxing reason as FontStyle

FontStyle and TextAlign reach Compose's companion via the mangled inline-class accessors (getCenter-e0LSkKk()I, getNormal-_-LCdwA()I) and box through the synthesized box-impl(I)L<Type>; static. FontFamily's companion getters return concrete subtypes (SystemFontFamily / GenericFontFamily) so each call uses its exact descriptor. All names verified against ui-text-android 1.11.2.1 bytecode.

Sample

The Greeting tab in MainActivity.cs now demos the new styling — color + italic serif center-aligned text, monospace end-aligned text, ellipsis clipping with MaxLines = 1, two-line clamp with reserved height, plus a TextField and OutlinedTextField exercising the new slots.

Verification

• dotnet test src/ComposeNet.SourceGenerators.Tests — 83/83 passing
• dotnet build src/ComposeNet.Compose — clean (PublicAPI.Unshipped.txt updated)
• dotnet build src/ComposeNet.Sample — clean

Deferred (blocked or out of scope)

• KeyboardOptions / KeyboardActions — KeyboardOptions ctor is stripped from the binding (inline-class params: KeyboardType, ImeAction, KeyboardCapitalization); needs a [ComposeBridge(JvmName="<init>")] follow-up.
• VisualTransformation, AnnotatedString, TextStyle, LinkAnnotation — all in androidx.compose.ui.text.input / androidx.compose.ui.text, still 0 exported types until the next Compose package release post dotnet/android-libraries#1440 (merged but not yet shipped).
• BasicText / BasicTextField / LocalTextStyle / FocusRequester — separate facades; out of scope here.

Breaking change

TextAlign is no longer a record struct. Callers that previously used the Pack static, Equals/Deconstruct, or accessed Value directly will need to migrate; the TextAlign.Left/Right/Center/Justify/Start/End/Unspecified accessors are unchanged in name and still typed TextAlign.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

[Copilot]

Pull request overview

Implements most of issue #58 by extending the ComposeNet facade to expose additional Text styling knobs and TextField/OutlinedTextField configuration slots, supported by source-generator updates that broaden what parameter shapes can be expressed as optional/defaultable Kotlin parameters.

Changes:

• Extend ComposeBridgeGenerator/ComposeFacadeGenerator to recognize nullable primitives (bool?, int?, long?, float?, double?) as “optional” defaultable parameters.
• Add new text-related wrapper types (FontFamily, FontStyle, TextOverflow) and migrate TextAlign to a boxed reference wrapper to match Compose’s nullable inline-class usage.
• Update sample + generator tests + public API tracking to cover the new surface area.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/ComposeNet.SourceGenerators/ComposeValueTypes.cs	Updates recognized packed value-type registry (adds TextOverflow, removes packed TextAlign).
src/ComposeNet.SourceGenerators/ComposeReferenceTypes.cs	Adds new reference-wrapper types (FontFamily, FontStyle, TextAlign) to the facade classification registry.
src/ComposeNet.SourceGenerators/ComposeFacadeGenerator.cs	Classifies nullable primitives as optional-value facade properties (doc comment needs a small update).
src/ComposeNet.SourceGenerators/ComposeBridgeGenerator.cs	Lowers nullable primitives via ?? zero-literals and updates default-bit clearing (comment needs a small update).
src/ComposeNet.SourceGenerators.Tests/FacadeGeneratorTests.cs	Adds coverage for nullable primitives and TextOverflow optional-value classification.
src/ComposeNet.SourceGenerators.Tests/BridgeGeneratorTests.cs	Adds coverage for nullable primitive lowering + packed TextOverflow lowering.
src/ComposeNet.Sample/MainActivity.cs	Demonstrates new Text styling and TextField slot properties (one comment needs a small wording correction).
src/ComposeNet.Compose/TextOverflow.cs	Introduces packed TextOverflow value wrapper and constants.
src/ComposeNet.Compose/TextAlign.cs	Migrates TextAlign from packed struct to boxed JNI-backed reference wrapper.
src/ComposeNet.Compose/PublicAPI.Unshipped.txt	Updates tracked public API for new types/properties and the TextAlign shape change.
src/ComposeNet.Compose/FontStyle.cs	Adds boxed JNI-backed FontStyle wrapper with companion constant resolution.
src/ComposeNet.Compose/FontFamily.cs	Adds JNI-backed FontFamily wrapper with companion constant resolution.
src/ComposeNet.Compose/ComposeBridges.cs	Extends bridge/facade signatures for Text, TextField, and OutlinedTextField to include new parameters/slots.