feat: detect and pay BOLT11 invoices inline in posts

[barrydeen]

Summary

• Detects lnbc/lntb/lnbcrt invoice strings in note content and renders an inline card showing the decoded amount, optional description, and expiry badge
• Tapping Pay Now shows a confirmation dialog, then routes through the active wallet provider (Spark or NWC)
• The card owns a 4-state machine — spinner while pending, ✓ Paid on success, ✗ Payment Failed on failure, each auto-resetting to the button after 3 seconds so the user can retry
• Wired through NoteActions.onPayInvoice to all feed surfaces: main feed, thread view, user profile, notifications, hashtag feeds, article feeds, and set feeds
• All UI strings localised to 10 languages (de, es, fr, it, pt, nl, zh, ja, ko, ru)
• Uses MaterialTheme.colorScheme.primary throughout — no hardcoded colours, adapts to every theme

Test plan

• Post a note containing a BOLT11 invoice (lnbc...) and confirm the inline card appears with the correct amount
• Tap Pay Now with a connected wallet — verify spinner appears, then ✓ Paid, then button resets
• Tap Pay Now with no wallet / on an already-paid invoice — verify ✗ Payment Failed appears in error colour, then resets
• Confirm card renders correctly in thread view, profile tab, notifications, and hashtag feed
• Confirm expired invoices show the Expired badge and the button is disabled
• Verify colours match the active theme (Nord, Dracula, Custom, etc.)
• Spot-check at least one non-English locale for the payment strings

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