feat(ux): welcome banner, dashboard auth fix, docs update

- WelcomeBanner.tsx: guest-only dismissible onboarding card on dashboard
  (localStorage pv_seen_welcome, Browse Bills CTA, X dismiss)
- useDashboard: add !!token to query key so login/logout triggers
  a fresh fetch without manual refresh
- ARCHITECTURE.md: WelcomeBanner component, auth-aware query keys,
  v0.6.1 feature history entry
- Roadmap: mark welcome banner items complete
- Add MVP planning notes (Phase 3-6 roadmap draft)

Co-Authored-By: Jack Levy

MVP threshold this make v1 complete.md

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+
+### Phase 3 — Personal Workflow & Context
+
+_Focus: Allowing users to organize data and adding the "Cross-Bill" intelligence layer._
+
+- **Collections / Watchlists:** `collections` table for public/private bill groupings shareable via UUID tokens.
+    
+- **Personal Notes:** Private `bill_notes` table to store user stances, tags, and pinned insights on bill detail pages.
+    
+
+- **Cross-Bill Referencing (New):**
+    
+    - **Extraction:** Update LLM prompts to identify and extract related bill identifiers (e.g., "H.R. 1234") from text.
+        
+    - **Referential Table:** Implement `bill_references` to map source-to-target bill relationships with context quotes.
+        
+    - **Ghost Hydration:** Create the `/api/admin/bills/hydrate` endpoint to fetch and analyze referenced bills not currently in the DB.
+        
+    - **UI Hover Previews:** Use `Radix UI` popovers in the `BriefPanel` to show snapshots of referenced legislation without leaving the page.
+        
+- **Weekly Digest:** Celery beat task to dispatch 7-day summaries of followed bills via ntfy and RSS.
+    
+
+---
+
+### Phase 4 — Accountability & Member Scoring
+
+_Focus: Deep-diving into legislative performance and voting records._
+
+- **Votes & Committees:** Fetch roll-call votes and committee actions from Congress.gov into a new `bill_votes` table.
+    
+- **Member Effectiveness Score:** Nightly Celery task calculating scores based on sponsored bills, advancement milestones, and "bills enacted" metrics.
+    
+- **Bipartisan Progress Metric (Proposed):** Enhance effectiveness scores by weighting co-sponsorship across party lines and committee movement in opposing chambers.
+    
+- **Representation Alignment:** Neutral view showing how member votes align with a user’s followed topics.
+    
+
+---
+
+### Phase 5 — Systemic Intelligence
+
+_Focus: Enhancing search and providing broader legislative context._
+
+- **Search Improvements:** Add filters for bill type, status, chamber, and date; implement "Search within member bills".
+    
+- **Topic-Scoped Search:** Allow users to search legislation exclusively within followed topics like "Healthcare" or "Energy".
+    
+- **Member Effectiveness Transparency:** Display the "Member Effectiveness" formula on profile pages to maintain non-partisan trust.
+    
+
+---
+
+### Phase 6 — Desktop & Polish
+
+_Focus: Optimization for professional-grade power users._
+
+- **Desktop View:** Multi-column layout with sticky sidebars and expanded grids optimized for large screens.
+    
+- **Notification Channels v2:** Expand beyond ntfy/RSS to include Discord webhooks, Telegram, and SMTP email.
+    
+- **Backfill Tasks:** Automate `first_name` and `last_name` population for all member records.
+    
+
+---
+
+## 🛠️ Updated Technical Implementation Details
+
+### Database Schema Updates
+
+|**Table**|**New Columns / Purpose**|
+|---|---|
+|**`bill_references`**|`source_id`, `target_id`, `context_quote` to link related bills.|
+|**`bill_notes`**|`user_id`, `bill_id`, `content`, `stance`, `tags`, `pinned`.|
+|**`collections`**|`user_id`, `name`, `slug`, `is_public` for shared watchlists.|
+|**`bill_votes`**|Stores roll-call data and results for accountability tracking.|
+
+### Enhanced LLM Pipeline
+
+The `llm_processor.py` task will now perform a dual-pass:
+
+1. **Analysis:** Generate the standard brief with citations and fact/inference labels.
+    
+2. **Mapping:** Extract bill IDs found in the text and insert them into the `bill_references` table. If a target ID is missing from the `bills` table, it triggers a low-priority `hydrate_bill` task.
+    
+
+### Performance Guardrails
+
+- **Selective Hydration:** The poller will only "Ghost Hydrate" referenced bills if they are from the current or previous Congress to prevent API exhaustion.
+    
+- **Cached Previews:** Referenced bill snapshots for hover tooltips will be cached in Redis to minimize database hits during dashboard scrolling.
+    
+