docs: add Phase 1 quick wins design document

Covers new field types (slider, color, time), keyboard navigation,
and form import/export.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/plans/2026-02-13-phase1-quick-wins-design.md

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+# Phase 1 — Quick Wins Design
+
+**Status:** Approved
+**Date:** 2026-02-13
+**Scope:** New field types, keyboard navigation, form import/export
+
+---
+
+## Overview
+
+Phase 1 adds three categories of improvements to Formfire:
+1. Three new field types (slider, color, time)
+2. Keyboard navigation in the form modal
+3. Form import/export via JSON files
+
+These features extend existing patterns with minimal architectural changes.
+
+---
+
+## 1. New Field Types
+
+### Type System Changes (`types.ts`)
+
+Extend `FieldType` union with `'slider' | 'color' | 'time'`.
+
+Add optional properties to `FormField`:
+- `min?: number` — slider minimum (default: 0)
+- `max?: number` — slider maximum (default: 100)
+- `step?: number` — slider step increment (default: 1)
+
+### Renderers (`field-renderers.ts`)
+
+| Type | HTML Element | getValue() | Notes |
+|------|-------------|------------|-------|
+| `slider` | `<input type="range">` + value label | `number` | Live value display, min/max/step from FormField |
+| `color` | `<input type="color">` + hex label | `string` (#hex) | Default: `#000000` |
+| `time` | `<input type="time">` | `string` (HH:MM) | Mirrors existing date renderer pattern |
+
+All three implement the standard `RenderedField` interface (getValue/setValue/setError).
+
+### Builder Changes (`form-builder.ts`)
+
+- Add `'slider'`, `'color'`, `'time'` to `FIELD_TYPES` array
+- Show Min/Max/Step settings when field type is `slider`
+- Placeholder support for `time` (same as date)
+
+### Validation (`validators.ts`)
+
+- Slider: validate value is within min/max range
+
+---
+
+## 2. Keyboard Navigation
+
+### Form Modal (`form-modal.ts`)
+
+Single `keydown` listener on modal contentEl with event delegation:
+
+- **Ctrl+Enter** → Submit form (always)
+- **Enter** on single-line inputs (text, number, date, time, color, dropdown) → Submit, unless a suggest dropdown is open
+- **Enter** on textarea → normal line break (no submit)
+- **Escape** → Close modal (already handled by Obsidian's Modal base class)
+
+### Field Renderer Accessibility (`field-renderers.ts`)
+
+- **Toggle**: Add `tabindex="0"`, Space/Enter to toggle
+- **Rating**: Add `tabindex="0"`, Arrow Left/Right to change value, Enter to confirm
+- **Tags**: Input already has focus handling, just needs tab-order
+
+Tab order follows field definition order naturally via DOM order.
+
+---
+
+## 3. Form Import/Export
+
+### New Module: `src/utils/form-io.ts`
+
+Two pure functions:
+
+```typescript
+exportForms(forms: FormDefinition[]): string
+```
+Serializes to JSON with version wrapper: `{ version: 1, forms: [...] }`.
+
+```typescript
+importForms(json: string): FormDefinition[]
+```
+Parses JSON, validates structure (forms array, each form has id/name/fields), generates new UUIDs for imported forms to prevent ID collisions.
+
+### Settings Tab Changes (`settings-tab.ts`)
+
+New buttons below "New Form":
+- **Export All** — Creates JSON blob, triggers browser download as `formfire-export.json`
+- **Import** — Opens native file input (`<input type="file" accept=".json">`), reads file, validates, adds forms to store
+
+Per-form **Export** button in the form list (alongside Edit/Duplicate/Delete). Exports single form.
+
+### Error Handling
+
+- Invalid JSON → `Notice("Invalid JSON file")`
+- Missing required fields → `Notice("Invalid form format")`
+- Success → `Notice("Imported X form(s)")`
+
+No import preview modal — validation is sufficient. YAGNI.
+
+---
+
+## Files Changed
+
+| File | Change |
+|------|--------|
+| `src/types.ts` | Extend FieldType, add min/max/step to FormField |
+| `src/ui/field-renderers.ts` | Add slider, color, time renderers; add tabindex/keyboard to toggle, rating |
+| `src/ui/form-modal.ts` | Add keydown listener for Ctrl+Enter, Enter submit |
+| `src/ui/form-builder.ts` | Extend FIELD_TYPES, add slider-specific settings |
+| `src/utils/validators.ts` | Add slider range validation |
+| `src/utils/form-io.ts` | **New** — exportForms, importForms |
+| `src/ui/settings-tab.ts` | Add Export All, Import, per-form Export buttons |
+| `styles.css` | Styles for slider, color, time fields |
+
+## Out of Scope
+
+- Import preview/diff modal
+- Clipboard-based import/export
+- Cloud sync or sharing
+- Migration logic between form versions