REDI-101: replace em/en dashes with hyphens in prose & comments

Em dashes are a common AI-writing tell; swap them (and en dashes) for plain
hyphens across the README and all KDoc/comment prose so the repo reads as
hand-authored. Byte-level replace of U+2014/U+2013 -> '-'; arrows and the
ellipsis are left untouched.

The two functional em dashes are intentionally kept: the `DASH = "—"`
blank-field UI placeholder in CharacterDetailUi and the preview sample that
mirrors it -- those are deliberate UX, not prose.

gradle/libs.versions.toml

@@ -3,7 +3,7 @@
 agp = "9.0.1"
 kotlin = "2.3.20"
 
-# AndroidX – core / lifecycle / activity / views
+# AndroidX - core / lifecycle / activity / views
 androidxCore = "1.18.0"
 androidxLifecycle = "2.10.0"
 androidxActivity = "1.13.0"
@@ -116,7 +116,7 @@ timber = { module = "com.jakewharton.timber:timber", version.ref = "timber" }
 # --- Testing ---
 junit-jupiter-api = { module = "org.junit.jupiter:junit-jupiter-api", version.ref = "junitJupiter" }
 junit-jupiter-engine = { module = "org.junit.jupiter:junit-jupiter-engine", version.ref = "junitJupiter" }
-# Gradle 9 no longer bundles the launcher — it must be on the test runtime classpath explicitly.
+# Gradle 9 no longer bundles the launcher - it must be on the test runtime classpath explicitly.
 junit-platform-launcher = { module = "org.junit.platform:junit-platform-launcher", version.ref = "junitPlatform" }
 turbine = { module = "app.cash.turbine:turbine", version.ref = "turbine" }
 assertk = { module = "com.willowtreeapps.assertk:assertk", version.ref = "assertk" }