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 list

Extracts the xterm fontFamily option into a TERMINAL_FONT_FAMILY constant in ThreadTerminalDrawer.tsx, expanding the fallback list to include common Nerd Font variants alongside existing monospaced defaults.

^{Macroscope summarized 044970f.}

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Note

Low Risk
Low risk UI-only change that adjusts the xterm fontFamily stack; no behavior, data, or security logic is modified.

Overview
Updates the integrated thread terminal to use a shared TERMINAL_FONT_FAMILY constant and expands the font fallback stack to include common Nerd Font variants (while keeping the existing default fonts first), improving rendering of Powerline/Nerd Font prompt glyphs when those fonts are installed.

^{Reviewed by Cursor Bugbot for commit 044970f. Bugbot is set up for automated code reviews on this repo. Configure here.}

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[macroscopeapp]

Approvability

Verdict: Approved

This change adds Nerd Font fallbacks to the terminal's font-family CSS property while preserving all existing fonts in order. It's a purely cosmetic change to support better glyph rendering, with no runtime behavior impact.

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