feat(ux): risk-tiered approval colors, hex dump + copy, deep-link Chainlist, typed timeouts

[BitHighlander]

Summary

UX polish on the approval surfaces shipped in #57.

• Risk-tiered colors in the Solana sign-method card. signMessage / signOffchainMessage are blue (read-only, no funds at risk). signTransaction is orange (you sign; the dApp broadcasts). signAndSendTransaction is red with a warning icon (signs and broadcasts immediately — irreversible).
• User-facing copy for off-chain messages — replaces "the signature is over a Solana-defined wrapper, not the bare bytes" with "Some apps require this format for off-chain logins. Verify the message text matches what you expect."
• Chainlist deep-link by chainId — chainlist.org/?search=56 lands on BSC's row instead of dumping the user on the homepage.
• Known chain names on the not-enabled card — shows "BNB Smart Chain" above "0x38 (56)" when the chain is in KNOWN_EVM_CHAINS. Stranger chainIds still fall back to mono hex.
• Hex dump formatting — non-printable message bytes now render as 8-byte chunks with newlines every 32 bytes, matching xxd / hexdump -C conventions instead of one unbroken hex string.
• Copy-to-clipboard icon next to "Message:" with a 1.5s green checkmark on success. Lets SIWS users paste the message into a verifier.
• Typed timeout error — new createTimeoutError helper sets kind: 'timeout' on the thrown error; methods.ts forwards it on transaction_error; Transaction.tsx keys off errorKind === 'timeout' instead of regex-matching the message string. Regex retained as a legacy fallback. Solana, TON, and Tron timeout sites all converted (~10 call sites).
• Better timeout copy — "Reject the request in the dApp, then try again." (Old copy didn't tell the user what action to take.)
• Sign-message message box max-height bumped 240→360px for typical SIWS messages.

Files

• chrome-extension/src/background/utils.ts — ProviderErrorKind, createTimeoutError
• chrome-extension/src/background/methods.ts — forward kind on transaction_error
• chrome-extension/src/background/chains/{solana,ton,tron}Handler.ts — use createTimeoutError at all 9 timeout throw sites
• pages/side-panel/src/approval/Transaction.tsx — errorKind state, kind-based timeout detection, clearer copy
• pages/side-panel/src/approval/ChainNotEnabledCard.tsx — known-name lookup, deep-link Chainlist
• pages/side-panel/src/approval/other/RequestMethodCard.tsx — risk-tiered colors + revised copy
• pages/side-panel/src/approval/other/RequestDetailsCard.tsx — hex dump formatting, copy button, larger box

Test plan

• dApp signMessage from a Solana site (e.g. SIWS login) — card is blue, message readable, copy button works (icon turns green for ~1.5s)
• dApp signTransaction from a Solana site — card is orange
• dApp signAndSendTransaction — card is red with warning icon
• Trigger a sign-message timeout (decline on device for >5min) — yellow "Took too long" card appears with "Reject the request in the dApp, then try again."
• Switch to a chain Pioneer doesn't know (e.g. invented chainId 0xfffffe) — chain-not-enabled card shows the chainId; Chainlist link opens chainlist.org/?search=<decimal>
• Switch to a chain in KNOWN_EVM_CHAINS but not yet provisioned — card shows "BNB Smart Chain" above the hex/decimal pair
• Sign a message that decodes to non-UTF-8 bytes — fallback renders as a readable hex dump (8 bytes per chunk, newlines every 32)
• Existing BSC switch flow from feat: Pioneer-sourced EVM chain registry + Solana sign-message UX #57 still works (no regression on the typed-timeout refactor)

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