chore: clear clippy lints for green CI

[scarmuega]

cargo clippy -- -D warnings (the CI lint gate) was failing on pre-existing warnings, so main is currently red. This clears them — a preliminary step for the next cshell release.

Fixes (no behavior change):

• drop unused imports (search, tx/common) and the never-constructed UTxORPCParameters struct (+ its orphaned serde import);
• collapse inner ifs into match guards in the explorer key handlers — the catch-all arm is a no-op _ => {}, so behavior is identical;
• redundant closure → method reference; drop a needless Ok(..?).

Verification

• cargo clippy -- -D warnings clean (also --all-targets);
• cargo test green (7).

Context: these fixes were authored alongside the invoke-arg test (#54) but landed on the branch just after #54 merged, so they need this separate PR to reach main.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9f89a437-2738-4810-ab7e-8360cd0c137d

📥 Commits

Reviewing files that changed from the base of the PR and between 2940081 and 1233092.

📒 Files selected for processing (5)

• src/explorer/widgets/tabs/accounts.rs
• src/explorer/widgets/tabs/transactions.rs
• src/provider/create.rs
• src/search/mod.rs
• src/tx/common.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/fix-clippy

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