## What are the changes about?
Add optional `bigclock_outline_fg`. When set, each big-clock digit gets a 1-cell outline drawn under the glyph so it stays readable over busy animations. Default is `null` (previous behavior).
When the outline is enabled, the gap under the clock is slightly larger so the stroke is not glued to the login box.
## What existing issue(s) does this resolve?
Fixes#1030
## Pre-requisites
- [x] I have tested & confirmed the changes work locally
- [x] I have read and fully adhere to the rules set in the contributing guidelines found in `CONTRIBUTING.md`
### Testing
- `zig build -Doptimize=ReleaseSafe` (zig 0.16.0)
- Greeter with `bigclock = en` and `bigclock_outline_fg = 0x20000000` over a `dur_file` animation
- Default `null` leaves stock look unchanged
### AI usage (per contributing.md)
Assisted by an LLM (xAI Grok) for exploration and drafting. I directed the design (optional outline only, no panel/box, stock layout otherwise), reviewed the Zig, fixed an `i2` overflow in the outline loop, verified the build/local greeter, and wrote this PR text.
Reviewed-on: https://codeberg.org/fairyglade/ly/pulls/1031
Reviewed-by: AnErrupTion <anerruption+codeberg@disroot.org>
