feat(config): add Wayland support, custom font features, and update search

- Enable Wayland as the Linux display server
- Increase background blur from 1 to 64 for frosted-glass effect
- Add detailed OpenType font_features for all four Iosevka Rootiest v2 weights
- Remove kitty_search submodule; replace with built-in search_scrollback
- Update kitty_scrollback_nvim path and add search jump arg to F1 binding
- Add F7 clear_selection binding under text manipulation section
- Update .gitignore with tmp/temp/testing/debug directory patterns
- Sync README to reflect current features and remove stale submodule install steps

.gitignore

@@ -6,3 +6,10 @@ saved-session.conf
 .gemini_session
 .claude_session
 .remember/
+
+# Personal testing/temporary files
+[Tt][Mm][Pp]/
+[Tt][Ee][Mm][Pp]/
+[Tt][Ee][Mm][Pp][Oo][Rr][Aa][Rr][Yy]/
+[Tt][Ee][Ss][Tt][Ii][Nn][Gg]/
+[Dd][Ee][Bb][Uu][Gg]/