feat: relative billing date, CSV export, milestone markers, tz labels…

[blackmamba-232]

Title:

feat: relative billing date, CSV export, milestone markers, timezone labels (#617–620)

Description:

Closes #617
Closes #618
Closes #619
Closes #620

Summary

#617 — Relative billing date in SubscriptionCard

• Next Run now shows the absolute date alongside a relative label (e.g. "Sep 15, 2026 · in 20 days")
• Dates fewer than 24 hours away display hours ("in 6 hours")
• Overdue subscriptions show "Overdue by X days" in red

#618 — CSV export for SubscriptionHistoryTable

• Added an "Export CSV" button above the table
• Downloads subscription-history-{date}.csv with columns: date, amount, currency, status, transaction hash
• Operates on all rows, not just the visible page

#619 — Milestone markers on FundingProgress bar

• New optional milestones prop accepts percentage or absolute amount values with optional labels
• Vertical tick marks render at each milestone position; turn green when the fill reaches them
• No milestones prop = bar renders exactly as before (fully backwards-compatible)

#620 — Timezone labels in PayoutScheduler

• Scheduled times now display the user's local timezone abbreviation (e.g. "3:00 PM WAT")
• A secondary line shows the UTC equivalent ("2:00 PM UTC")
• Timezone derived from the browser via Intl.DateTimeFormat().resolvedOptions().timeZone — no user setting required
• Cliff date display updated the same way

Changes

• src/components/SubscriptionCard.tsx
• src/components/SubscriptionHistoryTable.tsx
• src/components/FundingProgress.tsx
• src/components/PayoutScheduler.tsx

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