Transpiler terminology, build_playground path fix, docs updates

- README + docs: "compiler" → "transpiler" throughout
- build_playground: fix index.html source path (docs/src/playground/)
- Docs routes: consistent transpiler language

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Dale-Black

README.md

@@ -2,7 +2,7 @@
 
 # JavaScriptTarget.jl
 
-Compile Julia functions to JavaScript.
+Julia-to-JavaScript transpiler.
 
 [![CI](https://github.com/GroupTherapyOrg/JavaScriptTarget.jl/actions/workflows/ci.yml/badge.svg)](https://github.com/GroupTherapyOrg/JavaScriptTarget.jl/actions/workflows/ci.yml)
 [![Docs](https://github.com/GroupTherapyOrg/JavaScriptTarget.jl/actions/workflows/docs.yml/badge.svg)](https://grouptherapyorg.github.io/JavaScriptTarget.jl/)
@@ -24,7 +24,7 @@ println(result.js)
 
 Includes a self-hosted [browser playground](https://grouptherapyorg.github.io/JavaScriptTarget.jl/) — type Julia, run it as JS, no server needed.
 
-## What Compiles
+## What Transpiles
 
 | Julia | JavaScript |
 |---|---|
@@ -72,7 +72,7 @@ JST auto-detects when `optimize=false` is needed (when the optimized IR contains
 
 ## Package Compilation Registry
 
-JST can compile calls to registered Julia packages into their JavaScript equivalents — instead of compiling the package's internal implementation.
+JST can transpile calls to registered Julia packages into their JavaScript equivalents — instead of transpiling the package's internal implementation.
 
 ### Registering a Package
 
@@ -150,7 +150,7 @@ js("console.log('value:', \$1)", my_value)  # $1 substituted with compiled expre
 
 ## Related
 
-- [Therapy.jl](https://github.com/GroupTherapyOrg/Therapy.jl) — Signals-based web framework using JST for compilation
+- [Therapy.jl](https://github.com/GroupTherapyOrg/Therapy.jl) — Signals-based web framework using JST for transpilation
 - [Sessions.jl](https://github.com/GroupTherapyOrg/Sessions.jl) — Notebook IDE with JST-powered export
 
 ## License

docs/src/routes/api/index.jl

@@ -10,7 +10,7 @@
         Div(:class => "space-y-4",
             Div(:class => card,
                 H3(:class => "font-mono font-semibold text-warm-900 dark:text-warm-100", "compile(f, arg_types; kwargs...)"),
-                P(:class => "text-sm text-warm-600 dark:text-warm-400", "Compile a Julia function to JavaScript. Returns a ", Code(:class => "text-accent-500", "JSOutput"), " with the JS code, TypeScript declarations, and exports."),
+                P(:class => "text-sm text-warm-600 dark:text-warm-400", "Transpile a Julia function to JavaScript. Returns a ", Code(:class => "text-accent-500", "JSOutput"), " with the JS code, TypeScript declarations, and exports."),
                 Pre(:class => code_block, Code(:class => "language-julia", """result = compile(sin, (Float64,))
 println(result.js)       # JavaScript code
 println(result.exports)  # ["sin"]"""))),

docs/src/routes/getting-started.jl

@@ -7,15 +7,15 @@
 Pkg.add(url="https://github.com/GroupTherapyOrg/JavaScriptTarget.jl")""")),
 
         H2(:class => "text-xl font-semibold text-warm-800 dark:text-warm-200", "Basic Usage"),
-        P(:class => "text-warm-600 dark:text-warm-400", "Write a Julia function with typed arguments, then compile it to JavaScript:"),
+        P(:class => "text-warm-600 dark:text-warm-400", "Write a Julia function with typed arguments, then transpile it to JavaScript:"),
         Pre(:class => "bg-warm-900 dark:bg-warm-950 p-4 rounded border border-warm-800", Code(:class => "language-julia", """using JavaScriptTarget
 
 # Define a Julia function with typed arguments
 function add(a::Int32, b::Int32)::Int32
     return a + b
 end
 
-# Compile to JavaScript
+# Transpile to JavaScript
 result = compile(add, (Int32, Int32))
 println(result.js)
 # Output: function add(a, b) { return (a + b) | 0; }""")),
@@ -65,6 +65,6 @@ println(result.js)
         Span(count)
     )
 end
-# → Compiles to ~500 bytes of inline JavaScript"""))
+# → Transpiles to ~500 bytes of inline JavaScript"""))
     )
 end

docs/src/routes/index.jl

@@ -6,11 +6,11 @@
                 "Julia → JavaScript"
             ),
             H1(:class => "no-rule text-5xl md:text-6xl font-serif font-bold text-accent-500",
-                "Compiler"
+                "Transpiler"
             ),
             P(:class => "text-lg text-warm-600 dark:text-warm-400 max-w-2xl mx-auto leading-relaxed",
-                "Compile Julia functions to JavaScript via typed IR. ",
-                "Arrays, strings, math, closures, structs — all compile to clean, efficient JS."
+                "Transpile Julia functions to JavaScript via typed IR. ",
+                "Arrays, strings, math, closures, structs — all transpile to clean, efficient JS."
             ),
             Div(:class => "flex gap-4 justify-center pt-4",
                 A(:href => "./getting-started/",
@@ -44,7 +44,7 @@ println(result.js)  # Clean JS output""")
         # Live Playground
         Div(:class => "space-y-4",
             H2(:class => "text-xl font-semibold text-warm-800 dark:text-warm-200 text-center", "Try it Live"),
-            P(:class => "text-sm text-warm-600 dark:text-warm-400 text-center", "Write Julia in the left panel — see compiled JavaScript on the right. Runs entirely in your browser."),
+            P(:class => "text-sm text-warm-600 dark:text-warm-400 text-center", "Write Julia in the left panel — see transpiled JavaScript on the right. Runs entirely in your browser."),
             Div(:class => "w-full rounded-lg overflow-hidden border border-warm-200 dark:border-warm-800",
                 RawHtml("""<iframe src="./playground/index.html" style="width:100%;height:500px;border:none;" title="JST Playground"></iframe>""")
             )