fix: filter public messages correctly (#163)

Fixes #162

docs/superpowers/plans/2026-11-03-public-message-tab-filter-fix.md

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+# Public Message Tab Filter Fix Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Make the main-window **Public messages** tab show only ON4KST messages whose protocol receiver is public (`0`, represented as `ALL`).
+
+**Architecture:** Keep the global message roster as the complete event store and reuse `ChatController.toAllMessages()` as the single existing public-message view. A small package-visible refresh method updates all three Compose message tables so initial population and live updates use the same filtered sources.
+
+**Tech Stack:** Java 21, Kotlin 2.2, Compose Multiplatform, JUnit 5, Mockito, Gradle
+
+**Spec:** `github_docs/en-User-Interface.md` and `github_docs/de-Benutzeroberflaeche.md` document the intended global-tab semantics.
+
+## Global Constraints
+
+- Preserve ON4KST parsing, the complete global message history, message order and chat-category identity.
+- Preserve the selected-station message modes and the existing `pm to me`/`pm to other` semantics.
+- Do not stage, commit, push or publish without separate authorization.
+- Source comments remain English.
+
+## Review Focus
+
+- A genuine public frame remains in the public tab after initial population and a later refresh.
+- A PM to the local callsign never enters the public tab.
+- A directed message between other stations never enters the public tab.
+- Directed and QSO-of-the-other tables continue to receive their existing filtered views.
+- Repeated table refreshes replace rows without changing their newest-first order.
+
+---
+
+### Task 1: Route the Compose public table through the existing filtered view
+
+**Files:**
+- Modify: `app-desktop/src/main/java/kst4contest/view/Kst4ContestApplication.java`
+- Create: `app-desktop/src/test/kotlin/kst4contest/view/ComposeMessageTableRefreshTest.kt`
+
+**Interfaces:**
+- Consumes: `ChatController.toMeMessages()`, `ChatController.toAllMessages()`, and `ChatController.toOtherMessages()`
+- Produces: package-visible `Kst4ContestApplication.refreshComposeMessageTables(...)`
+
+- [x] **Step 1: Write the failing regression test**
+
+Create a mixed-message test whose mocked controller exposes separate directed, public and other-station views. Assert that the public table receives only `toAllMessages()`, then change the mocked public result, refresh again and assert the replacement remains filtered.
+
+- [x] **Step 2: Run the focused test and verify it fails**
+
+Run: `./gradlew.bat :app-desktop:test --tests kst4contest.view.ComposeMessageTableRefreshTest --console=plain`
+
+Expected: compilation failure because `refreshComposeMessageTables(...)` does not yet exist.
+
+- [x] **Step 3: Implement the shared refresh method**
+
+Add package-visible static `refreshComposeMessageTables(ChatController, DataTableState<ChatMessage>, DataTableState<ChatMessage>, DataTableState<ChatMessage>)`. It must populate the tables from `toMeMessages()`, `toAllMessages()` and `toOtherMessages()` respectively.
+
+- [x] **Step 4: Use the method for both update paths**
+
+Call the shared method from the global-message listener on the UI dispatcher and from the initial Compose table population. Remove both raw writes to the public table.
+
+- [x] **Step 5: Run focused and related tests**
+
+Run the new test plus `MessageTabsScreenTest`, `MessageBusManagementThreadChatFrameTest`, `SelectedStationMessageFlowTest`, and `SelectedStationMessagePredicateTest`.
+
+- [x] **Step 6: Run full verification**
+
+Run `./gradlew.bat build --console=plain`, inspect test-result XML and changed-file static-analysis reports, then run `git diff --check` and `git status --short --branch`.
+
+- [x] **Step 7: Assess documentation impact**
+
+Confirm the German and English manuals already state that the global public tab contains public messages only. Update no documentation unless implementation reveals a conflicting invariant.