change: distro tagline 'Immutable Fedora AI Workstation' -> 'My Personalized OS'

Per operator: "MiOS 'Immutable Fedora AI Workstation' -- change this to
MiOS 'My Personalized OS' as the description for the installed app".

Single-source change in mios.toml [branding].tagline / .tagline_long --
the tagline is now lifted (b669460), so this single edit propagates to
EVERY surface that displays it: Show-MiOSBanner subtitle (agreement
gate, dashboard), the installer banner taglines, mios-help.ps1 header,
and the Add/Remove Programs DisplayName.

This is exactly the SSOT-for-code payoff the lift was meant to enable.

Author: Kabuki94

usr/share/mios/mios.toml

@@ -1700,8 +1700,8 @@ fastfetch_config    = "fastfetch/config.jsonc"
 # taglines, the .lnk Description fields, the Add/Remove Programs
 # DisplayName, and the dashboard footer. Operator rebrands via
 # mios.html for a custom downstream (e.g. "MyCo Dev Workstation").
-tagline             = "Immutable Fedora AI Workstation"
-tagline_long        = "Immutable Fedora AI Workstation  --  Self-replicating bootc OS"
+tagline             = "My Personalized OS"
+tagline_long        = "My Personalized OS  --  Self-replicating bootc OS, immutable and personal"
 
 [branding.dashboard]
 frame_width_cols    = 80