fix(solana): use BTreeMap in exponent_finance and kamino_limit configs

[prasanna-anchorage]

Summary

PR #288 forbade std::collections::{HashMap, HashSet} via clippy disallowed-types and converted the existing preset configs to BTreeMap, but missed the two presets that landed during the same review window:

• exponent_finance (PR Add Exponent Finance Solana visualizer preset #275, merged 2026-05-12 22:00 UTC)
• kamino_limit (PR Add Kamino Limit Orders Solana preset #284, merged 2026-05-11 14:50 UTC)

Both still constructed HashMap and passed it where SolanaIntegrationConfigData now expects BTreeMap, so cargo build -p visualsign-solana fails on post-#288 main. This is blocking PR #278 (and any other PR rebasing onto main) from going green.

Two trivial 2-line edits: change HashMap::new() to BTreeMap::new() and update the use import in each file. No semantic change — SolanaIntegrationConfigData already deterministically orders via BTreeMap, so this just aligns construction with the expected type.

Test plan

• cargo build -p visualsign-solana succeeds locally
• cargo clippy -p visualsign-solana --all-targets -- -D warnings is clean locally
• cargo fmt --check is clean
• CI green

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Mechanical fix to align two preset configs (exponent_finance, kamino_limit) with the BTreeMap-based SolanaIntegrationConfigData introduced in #288. Both presets were merged during the same review window as #288 and still constructed HashMap, breaking the build.

Changes:

• Swap HashMap::new() for BTreeMap::new() in both preset configs
• Update use std::collections::HashMap imports to BTreeMap

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/chain_parsers/visualsign-solana/src/presets/kamino_limit/config.rs	Switches programs/instructions map construction from HashMap to BTreeMap
src/chain_parsers/visualsign-solana/src/presets/exponent_finance/config.rs	Same HashMap → BTreeMap switch for the exponent_finance preset

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[shahan-khatchadourian-anchorage]

BTreeMap 🚀