Update signing configuration to use 88oakapps.feels identifiers

- Update App Group IDs from group.com.tt.feels to group.com.88oakapps.feels
- Update iCloud container IDs from iCloud.com.tt.feels to iCloud.com.88oakapps.feels
- Sync code constants with entitlements across all targets (iOS, Watch, Widget)
- Update documentation in CLAUDE.md and PROJECT_OVERVIEW.md

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.claude/settings.local.json

@@ -34,7 +34,10 @@
       "Bash(unzip:*)",
       "Bash(plutil:*)",
       "Bash(done)",
-      "Bash(for:*)"
+      "Bash(for:*)",
+      "Bash(# Check Button and Label strings grep -rE ''\\(Button|Label|navigationTitle\\)\\\\\\(\"\"'' /Users/treyt/Desktop/code/Feels/Shared/ --include=\"\"*.swift\"\")",
+      "Bash(# Double-check a few of these strings to make sure they''re not used echo \"\"=== Checking ''Custom'' ===\"\" grep -rn ''\"\"Custom\"\"'' /Users/treyt/Desktop/code/Feels/Shared/ --include=\"\"*.swift\"\")",
+      "Bash(echo \"=== How ''3D card flip'' is used ===\" grep -rn \"3D card flip\" /Users/treyt/Desktop/code/Feels/Shared/ --include=\"*.swift\")"
     ],
     "ask": [
       "Bash(git commit:*)",