Answer budget within the context window; enforced reviews of completed todos

Context window
- Requests asked for the model's full max_output, but providers count
  input + output against the window: long chats with large-output models
  (DeepSeek V4.1 Flash, 384k) failed with "input too long" before automatic
  compaction (85 %) kicked in. max_tokens is now what the window leaves
  (estimated input = last usage + messages since), the chat is compacted when
  less than 32k would remain for an answer, and a context-overflow error
  compacts and retries once.
- ModelConfig.max_input (catalogue limit.input, editable in the provider
  settings) lowers the compaction threshold for models with an input limit.

Enforced reviews (modes with refine.rounds > 0, refine.after_todos default on)
- Every todo marked completed is reviewed against the work since the last
  review; with findings it is reopened and the feedback goes to the agent
  (max. rounds per todo). Passed reviews leave a visible note.
- Ending the turn with open todos sends the agent back to work while it makes
  progress (max. 10 reminders in a row without progress); such modes may take
  up to 2,000 steps per turn. Reaching the step limit is reported.

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

web/src/i18n/en.ts

@@ -333,6 +333,10 @@ export const en = {
   "wizard.idea.cadBox": "A box with a snap-on lid, inner size 80 × 50 × 30 mm",
   "wizard.idea.cadBracket": "A wall bracket for a 25 mm pipe with two M4 screw holes",
   "activity.reviewing": "Reviewing the result (round {round})…",
+  "chat.reviewPassed": "Review passed:",
+  "chat.todoReminder": "Back to work – {n} open todos:",
+  "agents.refineAfterTodos": "Review every completed todo and work until the list is done",
+  "agents.refineAfterTodosHint": "Each todo the agent marks completed is reviewed; with findings it is reopened. Ending the turn with open todos sends the agent back to work (for unattended runs, e.g. overnight). Off: only one review at the end of the turn.",
   "chat.reviewRound": "Review {round}: changes requested",
   "agents.refine": "Review loop",
   "agents.refineRounds": "Review rounds per task",
@@ -756,6 +760,8 @@ export const en = {
   "settings.pricesHint": "Prices per 1M tokens in the configured currency. Cache prices default to the input price.",
   "settings.modelsEmptyHint": "No models listed: they are discovered automatically from the provider.",
   "settings.context": "Context",
+  "settings.maxInput": "Max input",
+  "settings.maxInputHint": "Input limit, if the provider sets one below the context window (empty: the context window). The chat is compacted before the input reaches it.",
   "settings.maxOutput": "Max output",
   "settings.reasoning": "Reasoning",
   "settings.vision": "Vision",