Add configurable terminal font setting

[p0pmann]

What Changed

A new Terminal font setting added under Settings > General that lets users provide a custom CSS font-family stack for the terminal.

The setting is persisted in client settings, defaults to the existing terminal font stack, normalizes blank values back to that default, and applies live to open terminal instances without restarting them.

This is scoped to terminal font configuration only. It does not bundle fonts, validate installed fonts, or change fonts used elsewhere in the app.

Why

The terminal currently uses a fixed hardcoded font stack. That works for basic monospace rendering, but it makes it hard to use shells and prompt themes that rely on Nerd Fonts or other glyph-complete fonts, especially for zsh and oh-my-posh setups.

UI Changes

Before:

After:

Terminal with "FiraCode Nerd Font Mono", monospace

Screen.Recording.2026-03-30.at.1.35.14.PM-1.mov

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Add configurable terminal font family setting to the General settings panel

• Adds a terminalFontFamily field to ClientSettingsSchema in settings.ts with trimming, blank fallback to DEFAULT_TERMINAL_FONT_FAMILY, and a 1024-char max.
• Adds a 'Terminal font' input row to the General settings panel, with a reset action to restore the default font stack.
• The terminal in ThreadTerminalDrawer.tsx initializes with the user's font setting and updates live on change via applyTerminalFontFamily, which refits and refreshes the terminal.
• Extends legacy settings migration to normalize and persist terminalFontFamily when migrating from local storage.

^{Macroscope summarized 16c45d1.}

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[juliusmarminge]

proper appearance system in the works so don't wanna add one-off settings like this until we have that in place