docs: add settings implementation handoff note

docs/superpowers/plans/2026-03-18-settings-view-implementation-handoff.md

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+# Settings View Implementation Handoff (2026-03-18)
+
+## Completed Tasks Summary
+
+- Executed final quality gate verification commands in the `settings-side-panel` worktree.
+- Captured current git short status after verification.
+- Recorded outcomes and follow-up needs for handoff.
+
+## Verification Evidence Summary
+
+- `./gradlew :app:test` -> **PASS** (`BUILD SUCCESSFUL`), included `:app:testDebugUnitTest` and `:app:testReleaseUnitTest`.
+- `./gradlew :app:assembleDebug` -> **PASS** (`BUILD SUCCESSFUL`), `:app:assembleDebug` was up-to-date.
+- `./gradlew :app:lintDebug` -> **FAIL** (`BUILD FAILED`), lint reported 3 errors and 89 warnings.
+  - First blocking error:
+    - File: `app/src/main/java/space/hackenslacker/kanbn4droid/app/settings/SettingsPreferencesFragment.kt:25`
+    - Issue: `RestrictedApi` for calling `Preference.performClick()`.
+- `git status --short` after verification:
+  - `?? .kotlin/`
+
+## Deferred Items
+
+- Resolve `lintDebug` blocking errors before release-quality completion.
+- Decide whether `.kotlin/` should remain untracked or be ignored consistently across contributors.