chore: add pedantic workspace lints (#90)

Add [workspace.lints.rust] and wire each member crate up with
[lints] workspace = true:

  unsafe_code = "deny"        (forbid would break the Android JNI build)
  single_use_lifetimes = "warn"
  trivial_casts = "warn"
  unused_lifetimes = "warn"
  unused_qualifications = "warn"
  variant_size_differences = "warn"
  unexpected_cfgs = "warn"

unsafe_code is "deny" rather than the issue's "forbid" so the three
Android JNI FFI modules (android_keystore, android_clipboard, safe_area)
can opt back in with a scoped #![allow(unsafe_code)] — forbid cannot be
locally overridden. Pure crates carry no unsafe and stay clean.

Clean up the warnings the new lints surface:
- 150ish unused_qualifications removed via `cargo fix` (purely syntactic
  redundant-path-prefix removals).
- table_plugin: the TABLE_COLOUR import was #[cfg(test)]-gated while the
  camera clear-colour used the fully-qualified path; unqualifying it left
  a non-test build with no import. Made the import unconditional instead.
- assets/sources: the `as &[u8]` casts in embed_*_svg! coerce each
  fixed-size &[u8; N] to a uniform slice so the tuples fit the
  &[(&str, &[u8])] arrays — load-bearing, so scoped #[allow(trivial_casts)].

Workspace clippy -D warnings and the full test suite pass. Android build
not compiled here (needs the NDK; built separately per CLAUDE.md §15) —
the deny + scoped-allow keeps the JNI unsafe blocks legal.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

solitaire_engine/src/selection_plugin.rs

@@ -163,7 +163,7 @@ impl Plugin for SelectionPlugin {
                     update_selection_highlight.after(GameMutation).run_if(
                         resource_changed::<SelectionState>
                             .or(resource_changed::<KeyboardDragState>)
-                            .or(resource_changed::<crate::GameStateResource>),
+                            .or(resource_changed::<GameStateResource>),
                     ),
                 ),
             );
@@ -534,7 +534,7 @@ fn handle_selection_keys(
 /// destination after a lift. Players who want a different column simply
 /// press the right-arrow key once or twice.
 pub(crate) fn legal_destinations_for(
-    _bottom: &solitaire_core::Card,
+    _bottom: &Card,
     source: &KlondikePile,
     game: &GameState,
     stack_count: usize,
@@ -579,7 +579,7 @@ pub(crate) fn legal_destinations_for(
 /// Walks backwards from the last element and stops at the first face-down card
 /// (or when the slice is exhausted). Returns at least `1` when the top card is
 /// face-up; returns `0` for an empty slice or when the top card is face-down.
-fn face_up_run_len(cards: &[(solitaire_core::Card, bool)]) -> usize {
+fn face_up_run_len(cards: &[(Card, bool)]) -> usize {
     let mut count = 0;
     for (_, face_up) in cards.iter().rev() {
         if *face_up {
@@ -598,8 +598,8 @@ fn face_up_run_len(cards: &[(solitaire_core::Card, bool)]) -> usize {
 /// handler can attempt a foundation move first and fall through to a
 /// multi-card stack move rather than accepting a single-card tableau move.
 fn try_foundation_dest(
-    card: &solitaire_core::Card,
-    game: &solitaire_core::game_state::GameState,
+    card: &Card,
+    game: &GameState,
 ) -> Option<KlondikePile> {
     let source = game.pile_containing_card(card.clone())?;
     for foundation in [