docs: update CHANGELOG with CodeMirror editor and save-on-blur

CHANGELOG.md

@@ -20,6 +20,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `open_url` Tauri command for opening http/https URLs in system browser (lib.rs)
 - Tab system overhaul: renamed Claude→Model, Files→Docs, added 3 new tabs (Files, SSH, Memory) with PERSISTED-EAGER/LAZY mount strategies (ProjectBox.svelte)
 - FilesTab: VSCode-style directory tree sidebar + tabbed content viewer with shiki syntax highlighting, word wrap, image display via convertFileSrc, 10MB file size gate, collapsible/resizable sidebar, preview vs pinned tabs (FilesTab.svelte)
+- CodeEditor: CodeMirror 6 editor component with Catppuccin theme (reads --ctp-* CSS vars), 15 lazy-loaded language modes, auto-close brackets, bracket matching, code folding, line numbers, search, line wrapping, Ctrl+S save binding, blur event (CodeEditor.svelte)
+- FilesTab editor mode: files are now editable with dirty dot indicator on tabs, (unsaved) label in path bar, Ctrl+S save, auto-save dirty tabs on close (FilesTab.svelte)
+- Rust `write_file_content` command: writes content to existing files only — safety check prevents creating new files (lib.rs)
+- Save-on-blur setting: `files_save_on_blur` toggle in Settings → Defaults → Editor, auto-saves files when editor loses focus (SettingsTab.svelte, FilesTab.svelte)
 - SshTab: SSH connection CRUD panel with launch-to-terminal button, reuses existing ssh-bridge.ts model (SshTab.svelte)
 - MemoriesTab: pluggable knowledge explorer with MemoryAdapter interface, adapter registry, search, tag display, expandable cards (MemoriesTab.svelte, memory-adapter.ts)
 - Rust `list_directory_children` command: lazy tree expansion, hidden files skipped, dirs-first alphabetical sort (lib.rs)