Port WorldTabs, deselect-all, and save-performance fix to 1.21.11

[Copilot]

Three features present in the 26.1 branch were missing from the 1.21.11 branch. This PR backports all three.

Performance fix — batch saves in Quick Assign

commitQuickAssign previously called save() on every server mutation (O(n) disk writes). assignServer/unassignServer now accept a doSave boolean; the loop passes false and a single save() fires after all mutations.

// Before: N disk writes
TabConfig.getInstance().assignServer(sd.ip, quickAssignTabId);  // saves each time

// After: 1 disk write
TabConfig.getInstance().assignServer(sd.ip, quickAssignTabId, false);
// ...
TabConfig.getInstance().save(); // once, after the loop

Deselect All

• TabConfig.deselectAllServerTabs(ip) / deselectAllWorldTabs(worldId) — removes all non-locked tab assignments in one save
• "Deselect All" button added to AssignTabScreen and AssignWorldScreen

WorldTabs

Full tab system for SelectWorldScreen, mirroring the existing server-tab system:

• WorldTabSessionState — active-tab holder across screen reinits
• TabConfig — added WorldSortingType enum, world-tab fields (worldTabs, worldTabAssignments, enabled/dropdown/speed/sort/default/remember/assignOnAdd flags), load/save, and full assignment API
• WorldTabsDropdownController — sliding panel on SelectWorldScreen; uses reflection to filter the WorldSelectionList (mirrors TabDropdownController); supports Alt+W/S tab cycling
• AssignWorldScreen — checkbox UI to assign/deassign a world to world tabs
• WorldTabsSettingsScreen — full settings screen: add/rename/delete/reorder tabs plus all toggle/cycle settings
• ServerTabsClient — hooks SelectWorldScreen; count-based assign-on-add using a tracked Set<String> of known world IDs; resets world-tab session on title screen
• TitleScreenMixin — injects a ⚙ WorldTabs gear button next to the Singleplayer row (ServerTabs gear remains next to Multiplayer)

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• maven.fabricmc.net
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED --add-opens=java.xml/javax.xml.namespace=ALL-UNNAMED --add-opens=java.base/java.time=ALL-UNNAMED -Xmx2G -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant (dns block)
  • Triggering command: /usr/bin/curl curl -s REDACTED (dns block)
  • Triggering command: /usr/bin/curl curl -v REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Port the newly added features from the 26.1 version of the mod to the 1.21.11 version. Specifically, implement the following changes:

1. Add the WorldTabs feature.
2. Implement a proper deselect all functionality.
3. Apply the performance fix which saves all the servers together instead of saving them one by one.

The following is the prior conversation context from the user's chat exploration (may be truncated):

User: I have added alot of new features to 26.1 version of the mod, but not 1.21.11. Can you add them? The features mainly being WorldTabs and a proper deselect all and a performance fix which saves all the servers together instead of 1by1. Can you implement these changes to 1.21.11?

Assistant: I am currently waiting for your confirmation in the dialog box to proceed with implementing these features on the 1.21.11 version.

This pull request was created from Copilot chat.