Remove refresh icon and fix Safari/WebKit runtime errors

- Removed manual refresh button from frontend (kept auto-refresh functionality)
- Fixed WebKit 'object cannot be found' error by replacing absolute positioning with flexbox
- Added lazy loading to images to prevent preload warnings
- Cleaned up unused imports and variables:
  - Removed unused useRef import
  - Removed unused colors state variable and colorService
  - Removed unused ColorSwatch import from FilamentTableV2
  - Removed unused getModifierIcon function from MaterialBadge
- Updated tests to match current implementation
- Improved layout stability for better cross-browser compatibility
- Removed temporary migration scripts

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

database/migrations/006_add_basic_refill_filaments.sql

@@ -0,0 +1,29 @@
+-- Add 1 refill filament for each color as user owns all basic colors
+-- This creates PLA Basic filaments with 1 refill for each color in the database
+
+-- First, let's insert filaments for all existing colors
+INSERT INTO filaments (tip, finish, boja, boja_hex, refill, spulna, kolicina, cena)
+SELECT 
+    'PLA' as tip,
+    'Basic' as finish,
+    c.name as boja,
+    c.hex as boja_hex,
+    1 as refill,
+    0 as spulna,
+    1 as kolicina,
+    '3999' as cena
+FROM colors c
+WHERE NOT EXISTS (
+    -- Only insert if this exact combination doesn't already exist
+    SELECT 1 FROM filaments f 
+    WHERE f.tip = 'PLA' 
+    AND f.finish = 'Basic' 
+    AND f.boja = c.name
+);
+
+-- Update any existing PLA Basic filaments to have at least 1 refill
+UPDATE filaments
+SET refill = '1'
+WHERE tip = 'PLA' 
+AND finish = 'Basic'
+AND (refill IS NULL OR refill = '0' OR refill = '');