Fixed old bugs and improved performance and scraping capabilities

🚀 Key features
One-click scrape — hits Scrape Page and all fields populate automatically
Smart shipping date parsing — reads actual dates (Apr 7–14) or calculates from business day ranges (5–8 business days), skipping weekend days correctly
Local warehouse detection — multi-signal approach: checks green inline color style, truck icon proximity, computed style fallback, and product title scan
Shipping modal auto-open — automatically clicks the shipping row to open the delivery details popup and reads the table directly
Page type guard — shows a clear error if you're on a seller store page or search page instead of a product page
Dark mode — toggle with one click, preference saved across sessions
Works on Chrome and Firefox — Manifest V3, fully compliant with Firefox Add-ons requirements
🐛 Bugs fixed in this release
Non-local shipping modal not opening — the shipping trigger for non-local products sits inside a role="link" wrapper; previous versions blocked it. Fixed by switching to anchor-only navigation detection.
Wrong shipping dates for non-local products — scraper was picking up histogram bar labels (≤5 business days, 6 business days) instead of the actual delivery range from the table. Fixed with strict <td> priority scan.
Seller page navigation — clicking Scrape Page on a seller store page (mall.html) now shows a clear error instead of failing silently.
Warehouse showing Non Local when page says Local — expanded detection to use computed style fallback and product title scan in addition to inline style checks.
Price showing only integer — fixed decimal extraction by combining .a-price-whole and .a-price-fraction (Amazon), and matching European comma-formatted prices on Temu.