[nightshift] lint-doctor-fix: apply clippy pedantic/nursery auto-fixes

[nightshift-micr]

Automated by Nightshift v3 (GLM 5.1).

Task: lint-doctor-fix
Category: pr
Tool: cargo clippy --fix with -W clippy::pedantic -W clippy::nursery

Summary

Ran Clippy's auto-fix with pedantic and nursery lints enabled. Reduced warnings from 152 → 70 (remaining are structural: too_many_lines, excessive_bools, struct_field_names, assigning_clones).

Changes (10 files, -100/+86 lines)

Fix Type	Count	Files
map().unwrap_or() → map_or() / is_some_and() / map_or_else()	10	api.rs, auth_wizard.rs, parser.rs
Inlined format args (format!("{}", x) → format!("{x}"))	10	api.rs, error.rs, main.rs, quick.rs, search.rs
Added const fn	20+	auth.rs, auth_wizard.rs, cli.rs, main.rs, search.rs
Self:: instead of struct name in Display impls	14	cli.rs
Derived Eq alongside PartialEq	10	types.rs
u32 as f64 → f64::from() (lossless casts)	2	main.rs
Removed redundant closures	2	quick.rs
Removed needless # from raw string	1	auth_wizard.rs
Positive conditionals (if !x { a } else { b } → if x { b } else { a })	2	quick.rs
Doc comment backticks for code references	4	cli.rs
Unit pattern _ → (), trailing semicolons	2	parser.rs, main.rs

Verification

• ✅ cargo build passes
• ✅ All changes are mechanical Clippy auto-fixes
• ✅ No behavioral changes
• ✅ No new dependencies

Merge if useful, close if not.