feat(android): FabledSword theme — Material 3 + Google Fonts

M8 phase 1.4. Mirrors flutter_client/lib/theme/. Source of truth for hex
values is flutter_client/shared/fabledsword.tokens.json (manual sync until
cross-language codegen lands; ports the dark-surface + flat cohort).

Material 3 ColorScheme takes accent as primary; action colors
(Moss/Bronze/Oxblood) live in LocalActionColors as semantic roles per the
project_design_system rule "NEVER use accent for action buttons".

Typography uses androidx.compose.ui.text.googlefonts to fetch Fraunces /
Inter / JetBrains Mono at runtime via Play Services Fonts — matches the
Flutter client's `google_fonts` package (no bundled .ttf files in either
tree). Weights restricted to 400/500. Fraunces is reserved for ≥18sp
display/headline slots per the design-system rule.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

android/app/build.gradle.kts

@@ -98,6 +98,7 @@ dependencies {
     implementation(libs.compose.ui)
     implementation(libs.compose.ui.graphics)
     implementation(libs.compose.material3)
+    implementation(libs.compose.ui.text.google.fonts)
     debugImplementation(libs.compose.ui.tooling)
     implementation(libs.compose.ui.tooling.preview)