feat: peek-to-reveal on click/ctrl, pre-commit hooks, devShell, fmt fixes

- Click indicator ring to toggle password peek (persistent click-to-toggle)
- Ctrl-hold transient peek refactored to share peek path
- Cursor always visible (previously hidden at position 0, now shows at top of ring)
- .pre-commit-config.yaml: standard hooks + cargo fmt/clippy
- flake.nix: devShell with cargo, rustc, rustfmt, clippy, cargo-audit, prek
- cargo fmt pass across all source files (trailing whitespace, line wrapping)
- MPRIS error logging (silent failures now logged)
- Dependabot versioning-strategy: "increase" → "auto"

.github/dependabot.yml

@@ -16,7 +16,7 @@ updates:
       prefix: "deps"
     reviewers:
       - "JorySeverijnse"
-    versioning-strategy: "increase"
+    versioning-strategy: "auto"
     groups:
       rust-dependencies:
         patterns: