chore: add English/Turkish changelog cross-links

CHANGELOG_en.md

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+# Changelog — [Türkçe](CHANGELOG.md)
+
+## [4.0.4] — 2026-06-25
+
+### Added
+- Username validation function `validate_username` (returns detailed error messages)
+- Forbidden system usernames list (root, daemon, bin, sys, etc.)
+- Turkish character conversions extended to include uppercase letters (Ş, Ğ, İ, Ö, Ü, Ç)
+- New username validation keys in locale files (username_too_long, username_forbidden, username_invalid_start, username_invalid_chars)
+- `autologin` field added to UsersStep struct
+
+### Changed
+- Check/fail icons for username, password validation, and hostname inputs moved next to input fields
+- Error messages shown below inputs (username validation, password mismatch)
+- Bootloader page form layout updated to match users page (Frame, form_label, form_input_text/password)
+- Display manager step removed from step list (ISOs ship with single desktop environment)
+- Autologin feature moved from display manager step to users step
+- Display manager configuration made automatic (desktop_environment auto-detected)
+- Desktop environment selection used in SDDM/GDM configuration (xfce.desktop, gnome.desktop, etc.)
+- Autologin default value changed to false
+
+### Fixed
+- Sidebar text color disappearing in dark mode (SIDEBAR_TEXT set to white)
+- Incorrect character in derive_username function (ā → ğ)
+- unused_mut warning (name variable)
+- unused variable warning (err variable)
+- unused import warning (DisplayManagerStep)
+
+---
+
+## [4.0.3] — 2026-06-23
+
+### Added
+- Searchable keyboard layout/variant selector: egui `TextEdit` + `Area` popup custom implementation
+- `color_from_hex(hex: u32)` helper (`combobox_stil.rs`)
+- `layout_buf`, `variant_buf` fields (`KeyboardStep`)
+
+### Changed
+- `egui-dropdown` dependency removed (no longer used)
+- Layout/Variant selectors side-by-side → stacked, label width equalized to longest label
+- Popup item height 28px → 32px, gradient background (`draw_gradient_bg`) in `combobox.rs` style
+- `DROPDOWN_TEXT_COLOR` off-white → pure white (`color_from_hex(0xFFFFFF)`)
+- All color constants converted to hex format (`color_from_hex`)
+
+### Fixed
+- Popup not showing all items on first open due to old selection filter — buffer cleared on focus
+- `t!()` return type `Cow<str>` → `String` mismatch (`keyboard.rs`)
+
+### Changed
+- Slider maximum value now equals available disk space (excluding other partitions)
+- Selected partition capacity included in slider range in edit mode
+- `form_input_text` size field directly connected to `add_size_str`, formatted MB display added
+- Size label now in `"123.456 MB"` format instead of `"123 MB"` (for parseable values)
+
+### Fixed
+- Value written to size input field not written back to `add_size_str` — text edit remained read-only
+
+---
+
+## [4.0.1] — 2026-06-19
+
+### Added
+- `c_root_bg()` theme function
+- `show_root_password`, `show_root_password_confirm` fields (`UsersStep`)
+- `form_input_text` / `form_input_password` wrapped with `Frame` and `.frame(false)`
+
+### Changed
+- `form_input_text`: Wrapped in Frame, added stroke/fill/rounding, height 32→10
+- `form_input_password`: SVG eye icons (instead of emoji), Frame wrapped, `override_text_color`
+- Disk grid selection colors `theme::c_*()` → constant `(237,237,224,1)`
+- Disk list header and column headers: `Align::Center` → `Align::LEFT`, `vertical_centered` removed
+- Root password fields raw `TextEdit` → `form_input_password` (with eye icon + frame)
+- User form Frame color `theme::c_bg_widget()` → `(240,243,198)`
+- Manual disk list brand/model label ordering changed
+
+### Fixed
+- `users.rs:154` — `Color32` import error (missing `egui::` prefix)
+
+---
+
+## [4.0.0] — 2026-06-18
+
+### Added
+- `CHANGELOG.md`
+- `src/ui/combobox.rs` — ComboBox helpers (`show_combo_box`, `selectable_value`, `selectable_value_custom`, `draw_gradient_bg`)
+- `src/ui/combobox_stil.rs` — ComboBox visual constants and `apply_visuals()`
+- `src/steps/location.rs` — Region/timezone selection step
+- `src/steps/network.rs` — Network configuration step
+- `src/steps/rescue.rs` — Rescue mode
+- `xkbcommon` dependency
+- Keyboard visual: XKB keymap → egui drawing (`compile_layout`, `draw_layout`, `keysym_to_label`)
+- ISO‑105 key position mapping (function keys, numpad, navigation included)
+- Single character display per key (uppercase preferred)
+
+### Changed
+- Keyboard visual: KLE JSON download/parse → direct keymap compilation with xkbcommon
+- `Cargo.toml`: `ureq`, `serde_json` removed; `xkbcommon` added
+- ComboBox styles moved from `theme.rs` → `combobox_stil.rs`
+- Comment lines added to `secondary_button` gradient colors
+- `draw_gradient_bg` moved to `combobox_stil.rs`
+- All ComboBox usages updated with `theme::show_combo_box` / `theme::selectable_value`
+- Keyboard step (`keyboard.rs`): `ScrollArea`+`selectable_label` → ComboBox
+- `TextEdit::multiline` background made with per-widget `Frame::group`
+- `locale/` files updated
+- Font sizes increased (label 9→12, secondary 7→9)
+
+### Removed
+- `ureq`, `serde_json` dependencies
+- `assets/keyboards/KLE_*.json` cache files
+- `assets/keyboards/KB_*.svg` files
+- Old keyboard SVG loading code
+- KLE JSON download/cache logic
+- Old button examples in demo page
+
+### Fixed
+- `set_style`/`set_visuals` order: `set_style` called first
+- Region/timezone labels vertically aligned
+- Keyboard step `on_enter` not called on first render — layout also initialized in `show()`
+- `xkbcommon::Keycode` iteration (conversion with `raw()`)
+- `None::<&str>` → `None::<String>` type mismatch
+
+---
+
+## [4.0.0] — 2026-06-06
+
+### Added
+- Rescue mode (rescue step)
+- Network configuration step (NetworkManager/Wicd)
+- Netinstall step
+- LVM and LUKS encryption support
+- Demo mode (`--demo`)
+- Automatic installation (`--auto-install answer.toml`)
+- Multi-language support with `rust-i18n` (Turkish, English)
+- Gradient buttons (`gradient_button`, `secondary_button`)
+- Language selector (flag + label)
+- SVG loading support (`egui_extras` + `image`)
+- Slideshow (configurable with branding.toml)
+- Step list in sidebar (processed steps green ✔️)
+- Real-time installation file tracking
+- Advanced partitioning UI (usage bar, LUKS indicator, mount-point selector)
+
+### Changed
+- `pspec.xml`/`actions.py` → Cargo-based build
+- `comar`/`mudur` calls → `zbus` D-Bus and direct command execution
+- Shell-based password management → secure stdin piping (LUKS/GRUB)
+- Automatic username derivation (real name → system username)
+- Hostname validation/sanitization
+- Cleanup operations: user deletion, pool management, boot directory cleanup
+- Rsync command with dynamic exclusion
+- Version 4.0.1 → 4.0.0 (Cargo.toml compatibility)
+
+### Fixed
+- GRUB password writing security
+- Dracut/Mkinitcpio LVM module addition
+- EFI partition detection and mounting
+- Password strength indicator colors
+- Automatic partitioning (LVM/LUKS ordering)
+
+---
+
+## [0.1.0] — 2026-05-20
+
+### Added
+- First stable release
+- Project skeleton (egui + wgpu)
+- Step-based installation wizard
+- Automatic disk partitioning (GPT/MBR)
+- User creation (with password strength check)
+- Bootloader configuration (GRUB)
+- Display manager selection
+- Summary screen
+- Basic color theme (light/dark)
+- Customizable branding (branding.toml)
+- Error screen for rescue purposes
+- Job queue (JobQueue / async task management)
+- YALI serialization (installer state save/load)