Clean up nextest, gitattributes, and gitignore

- Remove Zed-specific test group overrides from nextest.toml
- Remove Zed WSL script line ending rule from gitattributes
- Simplify gitignore to generic development patterns

.gitignore

@@ -1,44 +1,33 @@
-**/*.db
-**/cargo-target
+# Build artifacts
 **/target
-**/venv
-**/.direnv
+**/cargo-target
 *.wasm
-*.xcodeproj
+
+# IDE and editor
 .DS_Store
-.blob_store
-.build
-.envrc
-.flatpak-builder
 .idea
-.netrc
-*.pyc
-.pytest_cache
-.swiftpm
-.swiftpm/config/registries.json
-.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
-.venv
 .vscode
-.wrangler
-.perf-runs
-/assets/*licenses.*
-/crates/collab/seed.json
-/crates/theme/schemas/theme.json
-/crates/zed/resources/flatpak/flatpak-cargo-sources.json
-/crates/project_panel/benches/linux_repo_snapshot.txt
-/dev.zed.Zed*.json
-/node_modules/
-/plugins/bin
-/script/node_modules
-/snap
-/zed.xcworkspace
+*.xcodeproj
+*.xcworkspace
 DerivedData/
-Packages
 xcuserdata/
 
-# Don't commit any secrets to the repo.
+# Python
+**/venv
+.venv
+*.pyc
+.pytest_cache
+
+# Nix
+**/.direnv
+.envrc
+/result
+
+# Environment and secrets
 .env
 .env.secret.toml
+.netrc
 
-# `nix build` output
-/result 
+# Misc
+**/*.db
+.build