Add terminal Nerd Font fallbacks

[Specter242]

What changed

Adds a named terminal font-family stack for the thread terminal that preserves the existing default fonts first, then adds common Nerd Font fallbacks before the final generic monospace fallback.

This keeps the current default appearance where SF Mono, Consolas, Liberation Mono, or Menlo work, while allowing Powerline/Nerd Font prompt glyphs to render when an installed Nerd Font can cover missing glyphs.

Closes #1918.

Why

The integrated terminal currently ends its fixed font stack at generic monospace. On Linux, shell prompts that use Nerd Font or Powerline glyphs can render as boxes/unknown characters even when a compatible Nerd Font is installed.

This is intentionally not a configurable terminal-font setting. PR #1572 was closed because a broader appearance system is planned; this PR only adds fallback fonts to the existing stack.

UI notes

Before, prompt glyphs render as boxes/unknown characters:

After, installed Nerd Font fallbacks cover the prompt glyphs:

The screenshots are cropped to show only the terminal prompt area.

Validation

• bun fmt
• bun lint passes with one existing eslint-plugin-unicorn(consistent-function-scoping) warning in apps/web/src/environments/runtime/catalog.test.ts
• bun typecheck passes with Bun 1.3.9 and Node 24.13.1

Note

Add Nerd Font fallbacks to the terminal font-family in ThreadTerminalDrawer

Extracts the terminal fontFamily string into a TERMINAL_FONT_FAMILY constant in ThreadTerminalDrawer.tsx and adds MesloLGS NF, JetBrainsMono Nerd Font Mono, and JetBrainsMono NF as fallbacks. This ensures Nerd Font glyphs (e.g. icons in shell prompts) render correctly for users who have these fonts installed.

^{Macroscope summarized 4bbee03.}

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Note

Low Risk
Presentation-only change to xterm font fallbacks in the thread terminal; no auth, data, or terminal I/O behavior changes.

Overview
The thread terminal’s xterm fontFamily is moved into a shared TERMINAL_FONT_FAMILY constant and wired into TerminalViewport instead of an inline string.

The stack still prefers the same system monospaces first (SF Mono, Consolas, Liberation Mono, Menlo), then adds Nerd Font fallbacks (MesloLGS NF, JetBrains Nerd variants) before generic monospace, so Powerline/Nerd prompt glyphs can render when those fonts are installed—especially on Linux—without changing default typography when they are not. The old inline list included JetBrains Mono (non-Nerd); that name is dropped in favor of the explicit Nerd Font entries.

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[macroscopeapp]

Approvability

Verdict: Needs human review

Minor font-family configuration change that adds Nerd Font fallbacks. An unresolved comment notes that 'JetBrains Mono' was inadvertently removed from the original font stack, which may be a regression worth addressing.

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Dismissing prior approval to re-evaluate 4bbee03

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[cursor]

Removed JetBrains Mono fallback

Low Severity

The new TERMINAL_FONT_FAMILY list drops "JetBrains Mono", which was in the previous inline fontFamily string. On setups where that was the first installed face in the stack, the terminal no longer uses it and may fall through to generic monospace, contrary to preserving the prior default fonts before Nerd Font fallbacks.

 

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[t3-code]

superseded by #4860