feat(terminal): Ability to set custom terminal fonts

[NoumanAMalik]

In the Settings modal, under Interface, at the bottom, added a new field to add a custom.

Whatever is added in this input, gets appended at the beginning of the default font families that were already defined from before. In the TerminalSessionManager.ts, I also added an event listener to automatically refresh the terminal whenever the font is changed, so the user sees it update right away.

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[rabanspiegel]

thank you ! will review

[rabanspiegel]

Great idea @NoumanAMalik.

A couple thoughts, it'd be great to have some save indicator or knowing whether the font has been set.

Two other fixes needed before merg:

• TerminalSessionManager.applyTheme will overwrite the user’s custom fontFamily whenever theme updates run (theme overrides can include a font). Please make the user setting take precedence (e.g., skip applying theme font if a custom font is set, or reapply the custom font after applyTheme).
• When the initial async getSettings() resolves, we set fontFamily but don’t call fitAddon.fit(), so the terminal can be mis‑sized until a resize. Please run fitAddon.fit() after applying the initial settings.

Let me know if you want to take another stab or whether I should finish it 🙏

[NoumanAMalik]

bet, I'll get to it and make another commit EOD

[NoumanAMalik]

When typing inside the text input field, there is a clear button as well as an keyboard shortcut badge showing the user to click enter to save.
When the save is succesful of the font family, a check mark will be shown to the user.

demo.-.save.indicator.mov

For the 2 bugs:

1. When TerminalSessionManager.applyTheme rules, after the font family is set, we reapply the custom font after applyTheme sets the font.
2. if the terminal is open, we run fitAddon.fit()

@rabanspiegel if you see any other issues, I'd be glad to address them.

[rabanspiegel]

Thank you, will review by EOD!