feat(web): implement complete workspace with themes, tabs, sidebar, and mobile

Transform CalcText from a single-document calculator into a full workspace
application with multi-document support, theming, and responsive mobile experience.

- Theme system: 5 presets (Light, Dark, Matrix, Midnight, Warm) + accent colors
- Document model with localStorage persistence and auto-save
- Tab bar with keyboard shortcuts (Ctrl+N/W/Tab/1-9), rename, close
- Sidebar with search, recent, favorites, folders, templates, drag-and-drop
- 5 templates: Budget, Invoice, Unit Converter, Trip Planner, Loan Calculator
- Status bar with cursor position, engine status, dedication to Igor Cassel
- Results panel: type-specific colors, click-to-copy, error hints
- Format toolbar: H, B, I, //, color labels with live preview toggle
- Syntax highlighting using theme CSS variables
- Error hover tooltips
- Mobile: bottom results tray, sidebar drawer, touch targets, safe areas
- Docker multi-stage build (Rust WASM + Vite + Nginx)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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# 4.2 — Templates
**Previous Step:** ← [Sidebar](../4.1-sidebar/4.1-sidebar.md)
**Next Step:** → [Theme System](../../05-theming/5.1-theme-system/5.1-theme-system.md)
---
## Page Metadata
| Property | Value |
|----------|-------|
| **Scenario** | 04 — File Organization |
| **Page Number** | 4.2 |
| **Platform** | Web (PWA), portable to macOS/Windows |
| **Page Type** | Sidebar Section + Modal (template preview) |
---
## Overview
**Page Purpose:** Provide ready-made starting documents that showcase CalcText's capabilities and help users get productive immediately. Templates are the product's best onboarding tool — they show by example.
**Success Criteria:**
- First-time user finds a relevant template within 10 seconds
- Templates demonstrate the product's unique features (variables, units, currencies, aggregators)
- Using a template creates a new document (never modifies the template)
---
## Template Library
| Template | Description | Showcases |
|----------|-------------|-----------|
| **Budget** | Monthly income/expenses with categories | Variables, aggregators (sum, total), percentages |
| **Invoice** | Service invoice with line items and tax | Variables, multiplication, percentages, currency |
| **Unit Converter** | Common conversions with examples | Unit expressions (kg to lb, km to mi, °C to °F) |
| **Trip Planner** | Travel budget with currency conversion | Currency conversion, date math, variables |
| **Loan Calculator** | Mortgage/loan with monthly payments | Financial functions, percentages, variables |
| **Blank** | Empty document | — (clean start) |
---
## Sidebar Templates Section
**OBJECT ID:** `sidebar-templates`
| Property | Value |
|----------|-------|
| Section header | "Templates" with 📋 icon |
| Collapsible | Yes |
| Default | Expanded on first launch, collapsed after first document created |
| Item height | 32px (slightly taller than files — more padding) |
| Item icon | Colored dot per template (visual distinction) |
| Item label | Template name, text-xs |
| Item sublabel | Brief description, text-3xs, muted, truncated |
### Template Item Interaction
| Action | Behavior |
|--------|----------|
| Click | Create new document from template. Title = template name. Opens in new tab. |
| Hover | Show full description in tooltip |
| Right-click | "Preview" option |
---
## Template Colors (Icon Dots)
| Template | Dot Color |
|----------|-----------|
| Budget | #10b981 (emerald) |
| Invoice | #6366f1 (indigo) |
| Unit Converter | #0d9488 (teal) |
| Trip Planner | #f59e0b (amber) |
| Loan Calculator | #7c3aed (violet) |
| Blank | var(--border) (gray) |
---
## Template Content
### Budget Template
```
# Monthly Budget
// Income
salary = 5000
freelance = 1200
total_income = salary + freelance
// Housing
rent = 1500
utilities = 150
insurance = 80
// Living
groceries = 400
transport = 120
subscriptions = 45
// Summary
total_expenses = sum
savings = total_income - total_expenses
savings_rate = savings / total_income
```
### Invoice Template
```
# Invoice #001
// Client: [Client Name]
// Date: [Date]
// Services
web_design = 2500
development = 4000
consulting = 150 * 8
// Expenses
hosting = 29.99
domain = 12.00
subtotal = sum
// Tax
tax_rate = 10%
tax = subtotal * tax_rate
total = subtotal + tax
```
### Unit Converter Template
```
# Unit Converter
// Weight
75 kg in lb
2.5 lb in kg
100 g in oz
// Distance
10 km in mi
26.2 mi in km
5280 ft in m
// Temperature
100 °C in °F
72 °F in °C
0 °C in K
// Data
1 GB in MB
500 MB in GB
1 TB in GB
```
### Trip Planner Template
```
# Trip Planner
// Budget
budget = $3000
// Flights
flight_out = $450
flight_back = $380
// Hotel
nights = 7
rate_per_night = $120
hotel_total = nights * rate_per_night
// Daily expenses
daily_food = $50
daily_transport = $20
daily_activities = $35
daily_total = daily_food + daily_transport + daily_activities
trip_expenses = daily_total * nights
// Summary
total_cost = flight_out + flight_back + hotel_total + trip_expenses
remaining = budget - total_cost
```
### Loan Calculator Template
```
# Loan Calculator
// Loan Details
principal = 250000
annual_rate = 6.5%
years = 30
// Monthly Calculation
monthly_rate = annual_rate / 12
num_payments = years * 12
// Monthly Payment
monthly_payment = principal * (monthly_rate * (1 + monthly_rate) ^ num_payments) / ((1 + monthly_rate) ^ num_payments - 1)
// Total Cost
total_paid = monthly_payment * num_payments
total_interest = total_paid - principal
// Summary
interest_ratio = total_interest / principal
```
---
## Technical Notes
- Templates are hardcoded in the app (not fetched from server). Stored as string constants.
- Creating from template: deep copy content, assign new id/title, save to documents array.
- Future: user-created templates (save document as template). Defer to v2.
- Cross-platform: same template content across all platforms.
---
_Created using Whiteport Design Studio (WDS) methodology_