fix(wasm): finalize config without desktop shell lookup

The Node smoke test expected shaper info logs after the default logger
became errors-only. Its failure also exposed config finalization calling
an unsupported passwd lookup on wasm and returning Unexpected before
normalization completed.

Skip shell defaults on wasm, matching upstream Zig. Assert successful
config finalization and window-width clamping in the Node test. Check
shaper output directly while verifying that info logs stay suppressed.
Document these behaviors in the wasm port notes.

Test Plan:
- cargo test -p ghostty-wasm --test node (passed)
- cargo test -p ghostty-config --lib (291 passed)
- cargo clippy --target wasm32-unknown-unknown -p ghostty-wasm -- -D warnings
- cargo clippy; cargo clippy --benches; cargo clippy --tests
- cargo +nightly fmt, followed by the native Clippy checks again
- git diff --check

Related-commit: 4fb9faa667

docs/rewrite/notes/wasm-W1.md

@@ -84,6 +84,9 @@ Differences/extras: `region_free`/`glyph_free` (Zig: "global free"),
 `config_diagnostics_count`, `ghostty_wasm_init`, `wasm_alloc/free`.
 `shaper_test` takes a `Face` (Zig takes a stale `GroupCache`) and prints into a
 `ghostty-terminal` Terminal.
+Config finalization skips desktop shell and home-directory lookup on wasm,
+matching Zig, but still applies normalization such as minimum window dimensions.
+The wasm logger forwards errors only, so `shaper_test` info records are suppressed.
 
 ## Deviations from the (stale) Zig web_canvas code
 - Zig refers to `Atlas.Format.rgba` and a 7-field `Metrics` that no longer
@@ -104,6 +107,8 @@ Differences/extras: `region_free`/`glyph_free` (Zig: "global free"),
   `target/wasm-test`) and runs `tests/node_test.js` under node with a fake
   canvas: config parse/finalize/format, atlas, face metrics/glyph_index/
   render, emoji presentation, shaper clustering, deferred face, debug canvas.
+  It checks that config finalization completes without errors and clamps window
+  dimensions, and that `shaper_test` prepares a run without emitting info logs.
   Skipped if node or the wasm32 target is missing.
 - Not ported: Zig tests in Atlas.Wasm (`toHostOwned`, stale).