v2.0.0: Multi-device support, i18n, event names, quick presets

[Copilot]

Major update to make the countdown app store-ready: responsive multi-device layout, Russian localization, and meaningful user features beyond the basic timer.

Multi-device support

• Added 6 platform targets in app.json: round (480, 466, 454, 416) and square (390, 336) covering GTR 4/3/Mini, T-Rex 2, GTS 4/Mini, Bip 5
• All UI computed proportionally via getDeviceInfo() — no hardcoded pixel values

const { width: W, height: H } = getDeviceInfo()
// Everything scales: font sizes, positions, widget dimensions
this.daysValue = this.createTimeBlock(startX, yPos, Math.floor(W * 0.19), ...)

New features

• Event name selector — cycle through 10 categories (Birthday, New Year, Deadline, Wedding, etc.) stored as i18n keys
• Quick presets — +1h, +1d, +1w, New Year buttons that populate date/time fields instantly
• 3-level color status — white → orange (< 1h) → red (≤ 5min)
• Toast notification on countdown expiry via @zos/interaction
• Settings persistence — settings page now loads existing saved target + event name

Localization

• Full ru-RU translations for all pages (page, setting, app-side)
• Clean en-US strings replacing spy-themed text
• App name localized in app.json i18n block

Cleanup

• Removed spy-themed code (agent IDs, mission codes, glitch effects)
• Simplified app-side/index.js to minimal service stub
• Simplified app.js — removed unused load/save stubs

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