chore: add i18n string literal ESLint rule to frontend

[angelplusultra]

Pull Request Type

• ✨ feat (New feature)
• 🐛 fix (Bug fix)
• ♻️ refactor (Code refactoring without changing behavior)
• 💄 style (UI style changes)
• 🔨 chore (Build, CI, maintenance)
• 📝 docs (Documentation updates)

Relevant Issues

resolves #

Description

Adds eslint-plugin-i18next-no-undefined-translation-keys to the frontend ESLint config with the translation-key-string-literal rule set to error. This enforces that all t() calls use plain string literals — no template literals or dynamic expressions — making translation keys statically analyzable and easier to search for across the codebase.

Fixed existing violations:

• SystemPrompts/index.jsx — changed a template literal t(`community_hub...`) to a regular string literal t("community_hub...").
• keyboardShortcuts.js — refactored the static SHORTCUTS object into a getShortcuts(t) function so translation keys are resolved via string literal t() calls rather than dynamic lookups like t(`keyboard-shortcuts.shortcuts.${shortcut.translationKey}`).
• Updated KeyboardShortcutsHelp/index.jsx to use the new getShortcuts(t) API.

Visuals (if applicable)

N/A

Additional Information

This rule only enforces that t() arguments are string literals. It does not validate that translation keys actually exist in locale files.

Developer Validations

• I ran yarn lint from the root of the repo & committed changes
• Relevant documentation has been updated (if applicable)
• I have tested my code functionality
• Docker build succeeds locally

[shatfield4]

LGTM

[timothycarambat]

How is this intended to function?

 <h2 className="text-xl font-semibold text-white">
            {t("keyboard-shortcuts.title")}
            {t("keyboard-shortcuts.this-key-does-not-work")}
          </h2>

Frontend eslint shows no errors?

Edit: Nvm I see this only checks that the input in t is a string literal. I dont see how this helps us a ton - the input of the t is already that via type hint. This does not help us a ton in preventing adding keys with DNE in the translations dictionaries