feat: public split visibility, RLS recursion fixes, and consolidated tasting permission management

- Added public discovery section for active splits on the landing page
- Refactored split detail page for guest support and login redirects
- Extracted SplitCard component for reuse
- Consolidated RLS policies for bottles and tastings to resolve permission errors
- Added unified SQL consolidation script for RLS and naming fixes
- Enhanced service logging for better database error diagnostics

enable_public_split_access.sql

@@ -0,0 +1,33 @@
+-- ============================================
+-- Enable Public Access for Bottle Splits
+-- ============================================
+-- This script enables unauthenticated users (guests) to view:
+-- 1. Profiles (to see hostnames)
+-- 2. Bottle Splits (if is_active = true)
+-- 3. Split Participants (to see progress bar data)
+-- ============================================
+
+-- 1. Profiles: Allow anyone to see usernames and avatars
+DROP POLICY IF EXISTS "profiles_select_policy" ON profiles;
+CREATE POLICY "profiles_select_policy" ON profiles
+  FOR SELECT USING (true);
+
+-- 2. Bottle Splits: Allow guests to see active splits
+-- This policy allows anyone to read splits that are marked as active.
+DROP POLICY IF EXISTS "bottle_splits_public_select" ON bottle_splits;
+CREATE POLICY "bottle_splits_public_select" ON bottle_splits
+  FOR SELECT USING (is_active = true);
+
+-- 3. Split Participants: Allow guests to see progress of active splits
+-- This is necessary to calculate the "taken" volume in the progress bar.
+DROP POLICY IF EXISTS "split_participants_public_select" ON split_participants;
+CREATE POLICY "split_participants_public_select" ON split_participants
+  FOR SELECT USING (
+    EXISTS (
+      SELECT 1 FROM public.bottle_splits 
+      WHERE id = split_participants.split_id AND is_active = true
+    )
+  );
+
+-- Note: Ensure "bottles_select_policy" in rls_public_bottle_access.sql 
+-- is also applied to allow guests to see bottle details for active splits.