docs: add Clients view and NavRail reorg design

docs/plans/2026-02-17-clients-view-navrail-reorg-design.md

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+# Clients View & NavRail Reorganization Design
+
+**Goal:** Add a Clients management view and reorder the NavRail into a logical workflow.
+
+---
+
+## NavRail Reorder
+
+**Current:** Dashboard, Timer, Projects, Entries, Reports, Invoices, Settings
+
+**New order (workflow flow):**
+1. Dashboard (`LayoutDashboard`) — Overview
+2. Timer (`Clock`) — Primary action
+3. Clients (`Users`) — **NEW** — Set up clients first
+4. Projects (`FolderKanban`) — Projects belong to clients
+5. Entries (`List`) — Time entries belong to projects
+6. Invoices (`FileText`) — Bill clients for entries
+7. Reports (`BarChart3`) — Analytics across everything
+8. Settings (`Settings`) — Utility, always last
+
+**Files:** `src/components/NavRail.vue`, `src/router/index.ts`
+
+---
+
+## Clients View
+
+### Layout
+- **Header**: "Clients" title + "+ Add" button (top right)
+- **Card grid**: 1-3 columns responsive (same as Projects.vue)
+- Each card: name (bold), company subtitle (if set), email (tertiary)
+- Hover reveals edit/delete icons (same pattern as Projects)
+- **Empty state**: `Users` icon + "No clients yet" + "Create Client" CTA
+
+### Create/Edit Dialog
+Two sections in the form:
+
+**Contact Info:**
+- Name (text, required)
+- Email (text, optional)
+- Phone (text, optional)
+- Address (textarea, optional)
+
+**Billing Details** (collapsible section — collapsed on create, open if data exists on edit):
+- Company (text) — Business name for invoice header
+- Tax ID (text) — VAT/Tax number shown on invoices
+- Payment Terms (text) — e.g. "Net 30", "Due on receipt"
+- Notes (textarea) — Internal notes
+
+### Delete Confirmation
+Same pattern as Projects — "Delete Client" with warning text.
+
+---
+
+## Backend Changes
+
+### Database Migration
+Add columns to `clients` table via `ALTER TABLE ADD COLUMN` statements in `init_db`:
+- `company TEXT`
+- `phone TEXT`
+- `tax_id TEXT`
+- `payment_terms TEXT`
+- `notes TEXT`
+
+### Rust Changes
+- Expand `Client` struct with new fields (all `Option<String>`)
+- Update `get_clients` SELECT to include new columns
+- Update `create_client` INSERT to include new columns
+- Update `update_client` UPDATE to include new columns
+- Update `export_data` client query to include new columns
+
+### Store Changes
+- Expand `Client` interface in `src/stores/clients.ts` with new optional fields