ui: Clean up editor placeholder text and alignment (top-right)

docs: NLP-3.5 Hardening Sprint — Complete audit reports (6 docs) - hardening-final-report.md: Full sprint summary (9/9 tasks done) - analyze-stress-test.md: 50-2000 chars, all pass - nlp-performance-breakdown.md: AraSpell ~700ms/word bottleneck - suggestion-priority-audit.md: grammar(3)>punc(2)>spell(1)>auto(0) - overlap-resolution-report.md: 4/4 overlap tests clean - text-processing-strategy.md: Skip AraSpell for >300 chars 500 chars: TIMEOUT→28s | Overlaps: 1→0 | API: backward compatible

docs: Phase O Final Hardening — 6 audit reports - phase-o-final-hardening.md: Known limitations investigated - api-contract-audit.md: Full API schema documentation - model-performance-report.md: RAM, latency, throughput benchmarks - frontend-robustness-report.md: 42/42 UI elements verified - security-audit.md: RLS, JWT, CORS, input validation - architecture-consistency-audit.md: 95% code-docs consistency Key findings: 500-char timeout (AraSpell bottleneck), grammar+punctuation dedup gap

docs: Complete V&V Audit Report — ALL phases A through N (95/100) - Phase A: Frontend 100/100 - Phase B: Auth 90/100 - Phase C: Database 100/100 (RLS verified, JWT blocked) - Phase D: Documents 100/100 (create, switch, persist) - Phase E: Summaries 100/100 (generate, 56% compression) - Phase F: Exports 100/100 (TXT, DOCX, PDF all work) - Phase G: NLP 88/100 (PuncAra 92% benchmark) - Phase H: Pipeline 92/100 - Phase I: API 85/100 - Phase J: Performance 95/100 - Phase K: Stress 95/100 (5 concurrent users OK) - Phase L: Security 80/100 (RLS, JWT verified) - Phase M: Deployment 100/100 - Phase N: UI/UX 100/100 (27 elements verified) - Verdict: PRODUCTION READY

docs: Full System V&V Audit — Production Readiness Report (93/100) - 62 automated checks: 56 passed, 6 minor issues - Frontend: 100/100, Pipeline: 92/100, Performance: 95/100 - PuncAra-v1 Benchmark: 92% acceptance rate (25 sentences) - All NLP models load and produce correct output - All API endpoints respond correctly - Verdict: PRODUCTION READY, proceed to NLP-4

docs: Complete Architecture Documentation (12 files) - 01-system-overview: High-level architecture diagram - 02-class-diagram: UML class diagram (Frontend + Backend) - 03-component-diagram: All modules and connections - 04-sequence-diagrams: 5 flows (Analysis, AutoComplete, Summarize, Save, Offline) - 05-dataflow-diagram: DFD Level 0 + Level 1 - 06-deployment-diagram: Docker + HF Spaces + CI/CD - 07-database-schema: ERD + RLS policies + triggers - 08-nlp-pipeline-diagram: Final NLP pipeline with all 5 models - 09-sync-engine-diagram: State machine + conflict resolution - 10-project-dependency-map: Full dependency graph - 11-production-architecture: Final production system diagram - 12-architecture-audit-report: Stats, risks, future expansion