feat: add auto-date titles for new documents (#14716)

## Summary

Adds an Editor setting to automatically title blank new documents with
the current date.
fixes https://github.com/toeverything/AFFiNE/issues/14709
https://www.loom.com/share/953b4eafcfb247839e977dca6f457229

## What Changed

- Added `Auto-title new docs with current date` under Editor settings
- Added `New doc date format`, shown only when auto-title is enabled
- Supported formats:
  - `DD-MM-YYYY`
  - `MM-DD-YYYY`
  - `YYYY-MM-DD`
  - `Journal style (localized)`
- Kept titles unique by appending duplicate-style suffixes:
  - `2026-03-24`
  - `2026-03-24(2)`
  - `2026-03-24(3)`

## Behavior

- Only applies to blank new docs
- Does not override explicitly provided titles
- Uses the existing journal-style localized formatter for the localized
option

## Implementation Notes

- Extended editor setting schema with:
  - `autoTitleNewDocWithCurrentDate`
  - `newDocDateTitleFormat`
- Added a helper for generating unique date-based titles
- Wired title generation into doc creation middleware
- Synced created titles into doc metadata so uniqueness works
consistently

## Tests

- Added unit coverage for:
  - date title formatting
  - duplicate suffix generation
  - doc creation middleware behavior
  - settings UI behavior


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* General settings: toggle to auto-insert current date into new document
titles; selectable formats: DD-MM-YYYY, MM-DD-YYYY, YYYY-MM-DD, and
localized "journal". Date-format chooser appears only when enabled.

* **Behavior**
* Blank new-docs are auto-populated per chosen format; user-provided
titles are preserved. Auto-generated titles avoid collisions by
appending incrementing suffixes.

* **Localization**
* Added translations for the setting, description, format chooser, and
all format labels.

* **Tests**
* Added UI and unit tests covering formatting, uniqueness, middleware
behavior, and interaction.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/i18n/src/i18n-completenesses.json

@@ -15,7 +15,7 @@
   "ja": 96,
   "ko": 97,
   "nb-NO": 47,
-  "pl": 98,
+  "pl": 97,
   "pt-BR": 96,
   "ru": 98,
   "sv-SE": 96,

packages/frontend/i18n/src/i18n.gen.ts

@@ -5490,6 +5490,38 @@ export function useAFFiNEI18N(): {
       * `New doc default mode`
       */
     ["com.affine.settings.editorSettings.general.default-new-doc.title"](): string;
+    /**
+      * `Auto-title new docs with current date`
+      */
+    ["com.affine.settings.editorSettings.general.auto-date-title.title"](): string;
+    /**
+      * `Automatically title blank new docs with today's date.`
+      */
+    ["com.affine.settings.editorSettings.general.auto-date-title.description"](): string;
+    /**
+      * `New doc date format`
+      */
+    ["com.affine.settings.editorSettings.general.auto-date-title.format.title"](): string;
+    /**
+      * `Choose the date format used for automatic new doc titles.`
+      */
+    ["com.affine.settings.editorSettings.general.auto-date-title.format.description"](): string;
+    /**
+      * `DD-MM-YYYY`
+      */
+    ["com.affine.settings.editorSettings.general.auto-date-title.format.dd-mm-yyyy"](): string;
+    /**
+      * `MM-DD-YYYY`
+      */
+    ["com.affine.settings.editorSettings.general.auto-date-title.format.mm-dd-yyyy"](): string;
+    /**
+      * `YYYY-MM-DD`
+      */
+    ["com.affine.settings.editorSettings.general.auto-date-title.format.yyyy-mm-dd"](): string;
+    /**
+      * `Journal style (localized)`
+      */
+    ["com.affine.settings.editorSettings.general.auto-date-title.format.journal"](): string;
     /**
       * `Customize your text experience.`
       */

packages/frontend/i18n/src/resources/en.json

@@ -1366,6 +1366,14 @@
   "com.affine.settings.editorSettings.general.default-code-block.wrap.title": "Wrap code in code blocks",
   "com.affine.settings.editorSettings.general.default-new-doc.description": "Default mode for new doc.",
   "com.affine.settings.editorSettings.general.default-new-doc.title": "New doc default mode",
+  "com.affine.settings.editorSettings.general.auto-date-title.title": "Auto-title new docs with current date",
+  "com.affine.settings.editorSettings.general.auto-date-title.description": "Automatically title blank new docs with today's date.",
+  "com.affine.settings.editorSettings.general.auto-date-title.format.title": "New doc date format",
+  "com.affine.settings.editorSettings.general.auto-date-title.format.description": "Choose the date format used for automatic new doc titles.",
+  "com.affine.settings.editorSettings.general.auto-date-title.format.dd-mm-yyyy": "DD-MM-YYYY",
+  "com.affine.settings.editorSettings.general.auto-date-title.format.mm-dd-yyyy": "MM-DD-YYYY",
+  "com.affine.settings.editorSettings.general.auto-date-title.format.yyyy-mm-dd": "YYYY-MM-DD",
+  "com.affine.settings.editorSettings.general.auto-date-title.format.journal": "Journal style (localized)",
   "com.affine.settings.editorSettings.general.font-family.custom.description": "Customize your text experience.",
   "com.affine.settings.editorSettings.general.font-family.custom.title": "Custom font family",
   "com.affine.settings.editorSettings.general.font-family.description": "Choose your editor's font family.",