refactor(cursor-rules): reorganize rules into logical directory structure

Restructure .cursor/rules from flat organization to hierarchical categories:
- app/: application-specific rules (timesafari, architectural decisions)
- database/: database-related rules (absurd-sql, legacy dexie)
- development/: development workflow rules
- docs/: documentation standards and markdown rules
- features/: feature-specific implementation rules (camera)
- workflow/: version control and workflow rules

Add base_context.mdc for shared context across all rule categories.
Improves maintainability and discoverability of cursor rules.

.cursor/rules/development/development_guide.mdc

@@ -0,0 +1,9 @@
+---
+globs: **/src/**/*
+alwaysApply: false
+---
+✅ use system date command to timestamp all interactions with accurate date and time
+✅ python script files must always have a blank line at their end
+✅ remove whitespace at the end of lines
+✅ use npm run lint-fix to check for warnings
+✅ do not use npm run dev let me handle running and supplying feedback