0.31.0 — Fable UI Themes Overhaul

Added: Google Fonts Signature Typography Integration — imported web font packages (Inter Tight, Plus Jakarta Sans, Newsreader, SF Pro Display, Syne, Space Grotesk, JetBrains Mono, Fira Code, VT323) so every theme preset features a distinct signature typography stack.
Added: Full-Width Theme Gallery & Grid Layout — refactored SettingsPage.tsx so the theme selector is no longer squished into a narrow 190px right column. It now occupies 100% of the settings container width with a responsive 4-column desktop grid.
Changed: Signature Typography & Visual Personalities for 8 Presets:
- ⚡ Vercel: Geist / Inter Tight font, radical monochrome #000 / #FFF, sharp 6px radius, zero shadows.
- 📐 Linear: Plus Jakarta Sans font, electric violet accent #5E6AD2, dark-first surface #08090A, 8px radius.
- 🧡 Claude: Newsreader serif display headings, oat crème background #F5F1EA, terracotta accent #D97757, 12px radius.
- 🍎 Apple: SF Pro Display typography, translucent backdrop blur, system blue #0A84FF, 14px squircle radius.
- 💳 Stripe: Syne & Space Grotesk display, indigo night #0A0A23, blurple accent #635BFF, elevated shadows.
- 📄 Paper: Newsreader serif display, warm studio paper background #F7F6F3, flat cards, 4px radius.
- 🧛 Catppuccin: JetBrains Mono & Fira Code monospaced display, official Mocha #1E1E2E mauve #CBA6F7 & Latte.
- 🖥️ Terminal: VT323 retro CRT mono font, pitch black #0C0C0C, phosphor neon green #33FF66, 0px radius.
Changed: Live Mini-Board Preview Cards (ThemePreviewCard) — added live signature font banners (Aa ✦ <FontName>), real text task cards ("Refactor Auth", "Theme Engine", "CLI Doctor"), and font signature rendering inside previews.