Implement Dashboard consolidation + Performance logging

Features:
- Add unified "Dashboard Complet" sheet (Excel) with all 9 sections
- Add unified "Dashboard Complet" page (PDF) with key metrics
- Fix VALOARE_ANTERIOARA NULL bug (use sumar_executiv_yoy directly)
- Add PerformanceLogger class for timing analysis
- Remove redundant consolidated sheets (keep only Dashboard Complet)

Bug fixes:
- Fix Excel formula error (=== interpreted as formula, changed to >>>)
- Fix args.output → args.output_dir in perf.summary()

Performance analysis:
- Add PERFORMANCE_ANALYSIS.md with detailed breakdown
- SQL queries take 94% of runtime (31 min), Excel/PDF only 1%
- Identified slow queries for optimization

Documentation:
- Update CLAUDE.md with new structure
- Add context handover for query optimization task

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

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

.claude/commands/session-update.md

@@ -0,0 +1,37 @@
+Update the current development session by:
+
+1. Check if `.claude/sessions/.current-session` exists to find the active session
+2. If no active session, inform user to start one with `/project:session-start`
+3. If session exists, append to the session file with:
+   - Current timestamp
+   - The update: $ARGUMENTS (or if no arguments, summarize recent activities)
+   - Git status summary:
+     * Files added/modified/deleted (from `git status --porcelain`)
+     * Current branch and last commit
+   - Todo list status:
+     * Number of completed/in-progress/pending tasks
+     * List any newly completed tasks
+   - Any issues encountered
+   - Solutions implemented
+   - Code changes made
+
+Keep updates concise but comprehensive for future reference.
+
+Example format:
+```
+### Update - 2025-06-16 12:15 PM
+
+**Summary**: Implemented user authentication
+
+**Git Changes**:
+- Modified: app/middleware.ts, lib/auth.ts
+- Added: app/login/page.tsx
+- Current branch: main (commit: abc123)
+
+**Todo Progress**: 3 completed, 1 in progress, 2 pending
+- ✓ Completed: Set up auth middleware
+- ✓ Completed: Create login page
+- ✓ Completed: Add logout functionality
+
+**Details**: [user's update or automatic summary]
+```