Terminal: Disable bold, tweak line height (#3215)

**Line Height**
In xterm.js, `lineHeight` is a multiplier on the *measured* cell height,
not the font size. So a `lineHeight` of 1 is actually closer to what
we'd expect here.

**Bold**
There seems to be a bug where setting bold makes the cell width wider.
Not sure if this is on `xterm.js` or its the font metrics. Better
instead to just disable bold.

Before:
<img width="320" height="419" alt="image"
src="https://github.com/user-attachments/assets/a65cc31c-6f01-4065-8825-291007e424fb"
/>

After:
<img width="315" height="350" alt="image"
src="https://github.com/user-attachments/assets/8dd5ce6e-ee9e-41fb-b964-d58620aacc2d"
/>

Author: benjaminleonard

app/components/Terminal.tsx

@@ -57,7 +57,10 @@ function getOptions(): ITerminalOptions {
     screenReaderMode: true,
     fontFamily: '"GT America Mono", monospace',
     fontSize: 13,
-    lineHeight: 1.2,
+    lineHeight: 1,
+    fontWeightBold: 400,
+    drawBoldTextInBrightColors: true,
+    letterSpacing: 0,
     windowOptions: {
       fullscreenWin: true,
       refreshWin: true,

app/ui/styles/index.css

@@ -281,3 +281,7 @@
     display: none;
   }
 }
+
+.xterm-bold {
+  -webkit-text-stroke: 0.75px currentColor;
+}

mock-api/serial-console.txt

@@ -2,8 +2,27 @@ Terminal theme test:
 red green yellow blue magenta cyan white
 bright-red bright-green bright-yellow bright-blue bright-magenta bright-cyan bright-white bright-black
 
+Bold A Bold A
+Bold A Bold A
+
 Booting `Debian GNU/Linux'
 
+               (
+           .    )   .
+       ~.   .  (  .   .~
+    ~_   '._.-'''-._.'   _~
+      '~..'         '..~'
+   ~~._ /             \ _.~~
+       ;/____\   /____\;
+~~~~~~~|`     ) (     `|~~~~~~~
+      _:     (   )     ;_
+   ~~'  \             /  '~~
+     _.~''.   ~~~   .''~._
+    ~    .''-.....-''.    ~
+       ~'   '  )  '   '~
+          '   (   '
+               )
+
 Loading Linux 6.12.38+deb13-amd64 ...
 Loading initial ramdisk ...
 EFI stub: Loaded initrd from LINUX_EFI_INITRD_MEDIA_GUID device path
@@ -138,4 +157,4 @@ Welcome to Debian GNU/Linux 13 (trixie)!
 
 Debian GNU/Linux 13 oxide-instance ttyS0
 
-oxide-instance login:
+oxide-instance login: