Chat tabs, chat mode, own modes, compaction notice, CLI binaries again

- Terminals and file managers as tabs of a chat; chat terminals keep running on
  the server (no idle timeout) and re-attach from any device
- "Just chat" in New session and a built-in chat mode with a lean prompt and only
  web tools; custom modes with kind (coding/conversation), read-only and tool picker
- Mode selector as a dropdown
- The chat shows running compactions (automatic: tokens and share of the limit)
  and labels summaries
- Docker image builds and serves the terminal client binaries again
- Fix: atomic session updates; background title/usage writes no longer undo each
  other (auto compaction triggered one turn late)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/i18n/en.ts

@@ -85,6 +85,8 @@ export const en = {
   "files.renameTo": "New name:",
   "files.copyTo": "Name of the copy:",
   "files.chatHere": "Open chat here",
+  "files.newTab": "Open file manager",
+  "files.closeTab": "Close file manager",
   "files.rename": "Rename",
   "files.duplicate": "Duplicate",
   "files.download": "Download",
@@ -235,6 +237,9 @@ export const en = {
   "wizard.title": "What do you want to do?",
   "wizard.subtitle": "Pick a task, say what you want, then press Start.",
   "wizard.whatToDo": "What do you want to do?",
+  "wizard.task.chat": "Just chat",
+  "wizard.task.chatDesc": "Ask, discuss, look things up – no project, no files",
+  "wizard.placeholder.chat": "What would you like to talk about?",
   "wizard.task.craft": "Craft something",
   "wizard.task.craftDesc": "Recreate a website, app, game or old program – or build something new",
   "wizard.task.build": "Work on code",
@@ -302,6 +307,9 @@ export const en = {
   "rename.generate": "Generate",
   "nav.terminal": "Terminal",
   "terminal.new": "New terminal",
+  "terminal.chatTab": "Chat",
+  "terminal.tab": "Terminal {n}",
+  "terminal.closeConfirm": "Close {name}? The shell and everything running in it are stopped.",
   "terminal.close": "Close terminal",
   "terminal.here": "Open a terminal in this folder",
   "terminal.connecting": "Connecting…",
@@ -556,6 +564,11 @@ export const en = {
   "chat.exportMd": "Markdown (.md)",
   "chat.exportJson": "JSON (.json)",
   "chat.empty": "Send a message to start.",
+  "chat.compactedAuto": "Context nearly full ({tokens} tokens) – conversation compacted automatically · summary",
+  "chat.compactedManual": "Conversation compacted at {tokens} tokens · summary",
+  "chat.compactingAuto": "Context nearly full – compacting the conversation automatically",
+  "chat.compactingManual": "Compacting the conversation",
+  "chat.compactingDetail": "{tokens} of {limit} tokens ({pct}) – the agent continues with a summary afterwards",
   "chat.compacted": "Conversation compacted – summary",
   "chat.context": "Context",
   "chat.contextHint": "{tokens} tokens in the last request",
@@ -842,8 +855,16 @@ export const en = {
   "agents.description": "Description",
   "agents.descriptionHint": "The main agent decides by this description when to delegate.",
   "agents.mode": "Type",
+  "agents.addMode": "New mode",
+  "agents.style": "Kind",
+  "agents.styleCoding": "Coding – project context and coding workflow",
+  "agents.styleChat": "Conversation – only this prompt, no project",
+  "agents.styleHint": "Conversation modes get just your prompt plus date and personal memory, like the built-in chat mode.",
+  "agents.readOnlyLabel": "Read-only",
+  "agents.readOnlyHint": "Only tools that change nothing (like plan mode)",
+  "agents.toolsSome": "{n} tools selected – only these are available",
   "agents.tools": "Tools",
-  "agents.toolsAll": "all tools (e.g. read, glob, grep)",
+  "agents.toolsAll": "Nothing selected = all tools",
   "agents.prompt": "Instructions",
   "agents.reset": "Reset",
   "agents.resetConfirm": "Reset \"{name}\" to the built-in defaults?",