fix(chain,compact-filters): replace Debug delegation in Display impls with per-variant messages

[none34829]

Description

BlockchainError and IterableFilterStoreError both implement Display by delegating to Debug:

// floresta-chain: BlockchainError
impl Display for BlockchainError {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        write!(f, "{self:?}")
    }
}

// floresta-compact-filters: IterableFilterStoreError
impl Display for IterableFilterStoreError {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        Debug::fmt(self, f)
    }
}

This produces machine-oriented output that is unsuitable for user-facing error messages and cannot be composed with thiserror's #[error(transparent)] in a meaningful way.

Changes

Replaced both with explicit match arms producing human-readable messages for each variant. Inner types that already implement Display are formatted with {}, while StumpError and Box<dyn DatabaseError> (which only implement Debug) continue to use {:?}.

This is complementary to PR #879, which adds Display impls to error types that have none. This PR improves types that already have a Display impl but delegate it to Debug.

Files changed

• crates/floresta-chain/src/pruned_utreexo/error.rs — BlockchainError (15 variants)
• crates/floresta-compact-filters/src/lib.rs — IterableFilterStoreError (4 variants)

Contributes to #667.

[Davidson-Souza]

Database error doesn't implement Display? It would be nice if it did

[none34829]

good catch, addressed in 5208a5c. added Display as a supertrait on DatabaseError and implemented it for FlatChainstoreError (the only concrete impl), so BlockchainError::Database now formats via Display ({e}) instead of Debug.