refactor(lib_commands): drop super::* + glob re-export in ui + cache

Hotspot G first slice — replace the cascade-import pattern in
lib_commands/ui/ and lib_commands/cache/ with explicit per-symbol
imports + per-command re-exports.

ui/mod.rs no longer reaches `pub(crate) use mini::*; pub(crate) use
bandsintown::*;` — instead it explicitly re-exports the 8 mini-player
Tauri commands + the 3 internal helpers consumed by lib.rs +
sync/tray.rs (PAUSE_RENDERING_JS, RESUME_RENDERING_JS,
persist_mini_pos_throttled), and fetch_bandsintown_events.

cache/mod.rs likewise lists each Tauri command from offline / hot /
downloads explicitly. The only cross-crate "internal" re-export is
`enqueue_analysis_seed` which analysis_runtime depends on.

Inside the .rs files: every `use super::*` is replaced with the
specific imports actually needed (super::offline::..., crate::audio,
crate::analysis_runtime::..., tauri::Manager, etc.).

Behaviour-preserving — no Tauri command name changed, no runtime
behaviour shift. Just removes the leak-everything-everywhere import
graph that cucadmuh's policy doc forbids.

src-tauri/src/lib_commands/cache/hot.rs

@@ -1,4 +1,9 @@
-use super::*;
+use crate::audio;
+use crate::subsonic_wire_user_agent;
+
+use super::super::file_transfer::stream_to_file;
+use super::downloads::{resolve_hot_cache_root, HotCacheDownloadResult};
+use super::offline::{enqueue_analysis_seed, enqueue_analysis_seed_from_file};
 
 #[tauri::command]
 pub(crate) async fn download_track_hot_cache(