refactor: split huge jobs/mod.rs into modular files & modernize slideshow

- Split src/jobs/mod.rs into specialized domain files under src/jobs/ (autologin, bootloader, execution, finish, keyboard, location, netinstall, network, partition, users) for better modularity and cleaner architecture.
- Integrated chrono-tz and enabled serde features on chrono in Cargo.toml.
- Added missing assets (remixicon font, icons, slides images/configs).
- Integrated localized slideshow presentation directly into UI, reading configurations from TOML.
- Updated Makefile to correctly target and install slideshow files into system directories.
- Cleaned up obsolete bin utility slides_test.rs.

locales/en.toml

@@ -57,7 +57,7 @@ users_title             = "User Account"
 users_description       = "Create a user account for your system."
 real_name_label         = "Full Name"
 username_label          = "Username"
-password_label          = "Password (at least 8 characters...)"
+password_label          = "Password "
 password_confirm_label  = "Confirm password"
 hostname_label          = "Computer name"
 username_invalid        = "Invalid username. Must start with a lowercase letter or underscore, max 32 characters."
@@ -204,6 +204,7 @@ job_timezone     = "Setting timezone"
 job_datetime     = "Configuring date & time"
 job_keyboard     = "Configuring keyboard layout"
 job_user         = "Creating user account"
+job_autologin    = "Applying automatic login"
 job_install_packages = "Installing selected packages"
 job_ldconfig = "Configuring shared libraries (ldconfig)"
 job_update_env = "Updating system environment"
@@ -216,6 +217,7 @@ mp_device          = "Device"
 mp_size            = "Size"
 mp_fstype          = "Filesystem"
 mp_mountpoint      = "Mount Point"
+mp_format_status   = "Format"
 mp_action          = "Action"
 mp_add             = "Add Partition"
 mp_delete          = "Delete"
@@ -229,6 +231,7 @@ mp_fs_btrfs        = "btrfs"
 mp_fs_xfs          = "xfs"
 mp_fs_fat32        = "FAT32 (EFI)"
 mp_fs_swap         = "swap"
+mp_skip_format     = "Skip Formatting (preserve existing data)"
 mp_size_gb         = "%{n} GB"
 mp_size_mb         = "%{n} MB"
 
@@ -299,6 +302,7 @@ admin_password_short   = "Root password must be at least 8 characters."
 datetime              = "Date & Time"
 datetime_title        = "Date & Time Settings"
 datetime_description  = "Configure the system date and time."
+datetime_current      = "Current time:"
 datetime_ntp_label    = "Network Time (NTP):"
 datetime_ntp_on       = "Enabled — time syncs automatically"
 datetime_ntp_off      = "Disabled — set manually"