Money Visualiser Assistant 1.3.1 — "The Big One"

Firefox has been sitting on v1 for a while. This update brings it all the way up to
parity with everything built since. Here's the haul.

━━ NEW: GOOGLE SEARCH INTEGRATION ━━
• Search "500 usd to eur" and the visualizer now appears right in the results,
docked under Google's own currency card.
• Live sync — retype the amount and the physical stats update as you go.
• Understands natural queries: "how much is 2 million dollars", "50k eur in gbp",
word numbers, and K/M/B shorthand.
• Works across international Google domains, not just google.com.

━━ NEW: ASSET CLASSES ━━
• Crypto: 100 coins supported, from BTC and ETH down to the long tail.
• Metals: 16 metals — gold, silver, platinum, palladium, plus base and
industrial metals like copper, lithium, and cobalt.
• Fiat: expanded to 54 currencies with proper symbols and flags.

━━ NEW: COMPARE MODE ━━
• Put two currencies side by side and see both piles at once instead of one.
• Pick a default comparison currency and it sticks.

━━ NEW: ON-PAGE DETECTION, REBUILT ━━
• The detector now reads structured product data and price attributes, not just
visible text — far better hit rate on real storefronts.
• Checkout preview card: a compact summary card in the corner of the page for
the price you're actually about to pay.
• Quick physical facts inline — bill count, stack height, and weight without
leaving the page.
• Shadow DOM isolation, so nothing the extension draws can be restyled or
broken by the host page's CSS.

━━ NEW: RIGHT-CLICK TO VISUALIZE ━━
• Select any price, right-click, "Visualize with Money Visualiser." Done.

━━ NEW: TOOLBAR BADGE ━━
• The icon now shows how many prices were detected on the current page at a
glance.

━━ NEW: HISTORY ━━
• Your last 15 visualizations are kept locally and are one click away from the
popup.

━━ NEW: SITE CONTROL ━━
• Per-site enable/disable straight from the popup.
• Allowlist mode for the opposite approach: off everywhere except where you say.
• Minimum price threshold, so small amounts stop cluttering pages.

━━ NEW: LANGUAGES ━━
• Full UI in English, German, Spanish, French, Japanese, Turkish, and Chinese,
with automatic matching to your browser language.

━━ REBUILT: THE WHOLE INTERFACE ━━
• New popup, settings, and first-run onboarding, rebuilt from scratch and
matched to moneyvisualiser.com's design.
• Guided setup on install: pick your currency and language in two steps.

Everything still runs locally. No accounts, no tracking, no data leaves your browser.