Add transaction accelerator (prioritisetransaction UI + API)
Full-stack feature for boosting transactions via bitcoind's
prioritisetransaction RPC:
Backend:
- New accelerator package with Accelerate, Cancel, MaxFeerate, List,
and background Cleanup goroutine (removes confirmed/dropped txs)
- RPC wrappers: GetMempoolEntry, PrioritiseTransaction,
GetRawMempoolVerbose, IsRPCError helpers
- SQLite boosted_txs table for persistence across restarts
- Revenue impact measured via getblocktemplate before/after comparison
- Hard cap at 2000 sat/vB; MaxFeerate uses fees.base (not modified)
to ignore our own prior priority adjustments
Frontend:
- Rocket icon in header with 10s jiggle animation
- AcceleratorPage with flame-gradient border, txid input, feerate
input, "Prioritize above all" button with spinner, boost list with
cancel buttons, and dismissible error/success messages
- Hash-based routing (#/accelerator)
- SharesBar font size bump