fix: resolve iOS PWA bottom nav positioning via flex layout

Switch .nav-bottom from position: fixed to a flex child of .app-shell.
With position: fixed and will-change: transform (used for the hide/show
animation), iOS compositor layers can misplace the element. As a flex
child (position: relative; flex-shrink: 0) at the end of a height: 100dvh
container the nav is guaranteed to sit flush at the physical screen bottom.

Remove padding-bottom clearance from .app-content, .tasks-page and
.dashboard - no longer needed since the nav no longer overlaps the
content area.

CHANGELOG.md

@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.20.4] - 2026-04-16
+
+### Fixed
+- iOS PWA: bottom navigation bar appeared visually higher than on Android. Changed `.nav-bottom` from `position: fixed` to a flex child of `.app-shell` (`position: relative; flex-shrink: 0`). With `position: fixed` and `will-change: transform` (used for the hide/show animation), iOS's compositor could misplace the nav bar. As a flex child at the end of a `height: 100dvh` container, the nav is guaranteed to sit flush at the physical screen bottom on all platforms. Removed the redundant `padding-bottom` clearance from `.app-content`, `.tasks-page`, and `.dashboard` (no longer needed since the nav no longer overlaps the content area).
+
 ## [0.20.3] - 2026-04-16
 
 ### Fixed

package.json

@@ -1,6 +1,6 @@
 {
   "name": "oikos",
-  "version": "0.20.3",
+  "version": "0.20.4",
   "description": "Self-hosted family planner - calendar, tasks, shopping, meal planning, budget and more. Private, open-source, no subscription.",
   "main": "server/index.js",
   "type": "module",

public/styles/dashboard.css

@@ -16,7 +16,7 @@
  * -------------------------------------------------------- */
 .dashboard {
   padding: var(--space-4);
-  padding-bottom: calc(var(--nav-bottom-height) + var(--safe-area-inset-bottom) + var(--space-16));
+  padding-bottom: var(--space-16);
   max-width: var(--content-max-width);
   margin: 0 auto;
 }

public/styles/layout.css

@@ -96,7 +96,6 @@
 .app-content {
   flex: 1;
   min-height: 0;
-  padding-bottom: calc(var(--nav-bottom-height) + var(--safe-area-inset-bottom));
   overflow-y: auto;
   overscroll-behavior-y: contain;
   -webkit-overflow-scrolling: touch;
@@ -114,10 +113,13 @@
  * Leichter Blur-Effekt für Glassmorphismus.
  * -------------------------------------------------------- */
 .nav-bottom {
-  position: fixed;
+  /* Flex-Kind von .app-shell statt position: fixed - zuverlässiger auf iOS PWA.
-  bottom: 0;
+   * position: fixed kann durch will-change: transform in iOS-Compositor-Layern
-  left: 0;
+   * falsch referenziert werden. Als Flex-Kind am Ende der 100dvh-App-Shell ist
-  right: 0;
+   * die Position garantiert am Viewport-Bottom. */
+  position: relative;
+  flex-shrink: 0;
+  width: 100%;
   background-color: color-mix(in srgb, var(--color-surface) 85%, transparent);
   border-top: 1px solid var(--color-border-subtle);
   display: flex;

public/styles/tasks.css

@@ -14,7 +14,7 @@
  * -------------------------------------------------------- */
 .tasks-page {
   padding: var(--space-4);
-  padding-bottom: calc(var(--nav-bottom-height) + var(--safe-area-inset-bottom) + var(--space-16));
+  padding-bottom: var(--space-16);
   max-width: var(--content-max-width);
   margin: 0 auto;
 }