UI/UX pass: readability, feedback, safer actions, DRK branding

Items 1–12 of the interface review:

- Larger UI font (UI_FONT_SIZE) across widgets, menus, dialogs, Treeview rows.
- DRK-red header bar; window title shows entry count; runtime-drawn red-cross
  icon (also written to data/icon.png for the launcher).
- Status bar colour-coded by severity; transient messages auto-clear after 8 s,
  queue-count messages stay.
- Tab 1: more form spacing, digits-only PLZ, explicit "Auswahl entfernen" +
  Delete key for queue rows, confirm on "Warteschlange leeren", modal on
  duplicate save.
- Tab 2: raw lat/lon columns replaced by one "Karte" column (checkmark / red
  "fehlt"); ▲/▼ arrow on the active sort column; hint line always shows the
  saved-entry count.
- "Karte öffnen" with no coordinates shows a dialog, not just a status line.
- Window size/position remembered between sessions (data/window.json).

Verified by building and driving the window under Homebrew Python 3.12 / Tk 9;
non-GUI smoke tests still pass. Docs updated (changelog, overview, improvements,
data-model, setup, dev-notes).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docs/improvements.md

@@ -188,9 +188,32 @@ tile pack — larger effort).
 
 ---
 
+## UI/UX review (2026-09-07)
+
+Second review, focused on the interface. Items 1–12 implemented; 13 deferred.
+
+| # | Change | Status |
+|---|--------|--------|
+| 1 | Larger base font + taller Treeview rows (`UI_FONT_SIZE`) | ✅ |
+| 2 | Colour-coded status bar + 8 s auto-clear to a neutral state | ✅ |
+| 3 | "Warteschlange leeren" asks for confirmation; more form spacing | ✅ |
+| 4 | ▲/▼ arrow on the active sort column in Tab 2 | ✅ |
+| 5 | Dropped the now-redundant `(JJJJ-MM-TT)` hint | ✅ |
+| 6 | Tab 2: single **"Karte"** column (`✓` / red `fehlt`) instead of raw lat/lon | ✅ |
+| 7 | Explicit "Auswahl entfernen" button + <kbd>Delete</kbd> key for queue rows | ✅ |
+| 8 | Duplicate save shows a modal with the list, not a transient hint | ✅ |
+| 9 | Persistent entry count (window title + Tab 2 hint line) | ✅ |
+| 10 | "Karte öffnen" with no coordinates shows a dialog | ✅ |
+| 11 | Remember window size & position (`data/window.json`) | ✅ |
+| 12 | DRK-red header bar + runtime-drawn red-cross icon (`data/icon.png`) | ✅ |
+| 13 | One-click "Hinzufügen & sofort speichern" | ⬜ deferred |
+
+Full custom DRK-red *theme* (recolouring `primary` etc.) was **not** done — the
+red header bar gives the branding without fighting ttkbootstrap's theme system.
+
 ## Suggested order of remaining work
 
 1. Initial git commit (item 4), then decide on committing `orte.csv`.
 2. Pinned deps + `run.sh` / `.desktop` launcher in the repo (item 5).
-3. Stable `id` column (item 7) and a modal duplicate prompt (item 8).
+3. Stable `id` column (item 7 of the first review).
 4. Formalize tests (item 10); offline map (item 9) only if offline use becomes real.