feat(web): add Iconify icon search, collection browsing & fix selecti…

[phanex]

🚀 Features & Improvements

🎨 Iconify Icon Browser (C shortcut)

• Global Search & Collection Browsing: Integrated Iconify API supporting 200+ icon sets (>200,000 monochrome icons).
• Categorized Browsing: Popular sets (Lucide, Tabler, Material Symbols, Phosphor, Boxicons, Font Awesome, etc.) and a Browse All Collections view grouped by official Iconify categories.
• Dynamic Style Variants & Category Filtering: Automatic detection of style suffixes (Outline, Filled, Rounded, Sharp, Duotone) per collection.
• Thermal Printer Dithering Compatibility: Icons insert as monochrome #000000 data URLs fully compatible with 1-bit thermal print dithering.
• Inspector Integration: Selecting an icon element displays metadata and a Replace Icon button.
• Command Palette Integration: Added C shortcut and Add icon command to ⌘K Command Palette. Made ⌘K commands footer label interactive.

🐛 Bug Fix: Async Image & Icon Selection Handles

• Fixed stale Konva Transformer bounding box: Fixed an issue where asynchronously loaded Image/Icon elements rendered an initial placeholder <Group> and failed to re-bind Konva's Transformer when the image finished loading.
• Added deps prop to ElementWrapper to automatically re-bind selection handles on asset resolution.

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🧪 Verification

• Verified build passes clean (npm run build).
• Verified icon insertion, collection browsing, category filtering, replace icon flow, and immediate selection handles live in browser.

Closes #29