Migrate export dialog to web

Closes #3023.

ftl/core/exporting.ftl

@@ -11,11 +11,24 @@ exporting-export = Export...
 exporting-export-format = <b>Export format</b>:
 exporting-include = <b>Include</b>:
 exporting-include-html-and-media-references = Include HTML and media references
+exporting-include-html-and-media-references-help =
+    If enabled, markup and media information will be kept. Suitable if the file is intended to be reimported by Anki
+    or another app that can render HTML.
 exporting-include-media = Include media
+exporting-include-media-help = If enabled, referenced media files will be bundled.
 exporting-include-scheduling-information = Include scheduling information
+exporting-include-scheduling-information-help =
+    If enabled, study data like your review history and card intervals will be exported.
+    Unsuitable for sharing decks with others.
 exporting-include-deck-configs = Include deck presets
+exporting-include-deck-configs-help =
+    If enabled, your deck option prests will be exported. However, the default preset is *never* shared.
 exporting-include-tags = Include tags
+exporting-include-tags-help = If enabled, an additional column with note tags will be included.
 exporting-support-older-anki-versions = Support older Anki versions (slower/larger files)
+exporting-support-older-anki-versions-help =
+    If enabled, the resulting file may also be imported by some outdated Anki clients, but it will
+    be larger, and importing and exporting will take longer.
 exporting-notes-in-plain-text = Notes in Plain Text
 exporting-selected-notes = Selected Notes
 exporting-card-exported =
@@ -40,5 +53,23 @@ exporting-processed-media-files =
        *[other] Processed { $count } media files...
     }
 exporting-include-deck = Include deck name
+exporting-include-deck-help =
+    If enabled, an additional column with deck names will be included. This will allow
+    the importer to sort cards into the intended decks.
 exporting-include-notetype = Include notetype name
+exporting-include-notetype-help =
+    If enabled, an additional column with notetype names will be included. This will allow
+    the importer to assign notes the intended notetypes.
 exporting-include-guid = Include unique identifier
+exporting-include-guid-help =
+    If enabled, an additional column with unique notetype identifiers will be included.
+    This allows to identify and update the exact orignal notes when the file is later reimported.
+exporting-format = Format
+exporting-content = Content
+exporting-format-help =
+    Anki supports multiple file formats for differing use cases:
+    
+    - `{ exporting-anki-collection-package }`: Contains your entire collection. Useful for back-ups or moving between devices.
+    - `{ exporting-anki-deck-package }`: Lets you control exactly which notes and what data to include. Ideal for sharing decks with other users.
+    - `{ exporting-notes-in-plain-text }`: Converts notes into the universal CSV format, readable by many third-party tools like text editors or spreadsheet apps.
+    - `{ exporting-cards-in-plain-text }`: Converts the rendered front and back sides of cards into CSV format.

proto/anki/frontend.proto

@@ -10,6 +10,8 @@ package anki.frontend;
 import "anki/scheduler.proto";
 import "anki/generic.proto";
 import "anki/search.proto";
+import "anki/notes.proto";
+import "anki/import_export.proto";
 
 service FrontendService {
   // Returns values from the reviewer
@@ -22,6 +24,18 @@ service FrontendService {
   rpc ImportDone(generic.Empty) returns (generic.Empty);
 
   rpc SearchInBrowser(search.SearchNode) returns (generic.Empty);
+
+  // Get an export location chosen by the user
+  rpc GetExportFilePath(ExportFilePathRequest) returns (generic.String);
+
+  // Retrieve note ids to include in export file
+  rpc GetNotesToExport(generic.Empty) returns (notes.NoteIds);
+
+  // Show a tooltip in the main window
+  rpc ShowTooltip(generic.String) returns (generic.Empty);
+
+  rpc TemporarilyCloseAndExportCollectionPackage(
+      import_export.ExportCollectionPackageRequest) returns (generic.Empty);
 }
 
 service BackendFrontendService {}
@@ -35,3 +49,9 @@ message SetSchedulingStatesRequest {
   string key = 1;
   scheduler.SchedulingStates states = 2;
 }
+
+message ExportFilePathRequest {
+  string exporter = 1;
+  string extension = 2;
+  string filename = 3;
+}

pylib/anki/collection.py

@@ -10,6 +10,7 @@
     card_rendering_pb2,
     collection_pb2,
     config_pb2,
+    frontend_pb2,
     generic_pb2,
     image_occlusion_pb2,
     import_export_pb2,
@@ -57,6 +58,10 @@
 MediaSyncStatus = sync_pb2.MediaSyncStatusResponse
 FsrsItem = scheduler_pb2.FsrsItem
 FsrsReview = scheduler_pb2.FsrsReview
+NoteIds = notes_pb2.NoteIds
+String = generic_pb2.String
+ExportFilePathRequest = frontend_pb2.ExportFilePathRequest
+ExportCollectionPackageRequest = import_export_pb2.ExportCollectionPackageRequest
 
 import os
 import sys
@@ -352,9 +357,12 @@ def export_collection_package(
         self, out_path: str, include_media: bool, legacy: bool
     ) -> None:
         self.close_for_full_sync()
-        self._backend.export_collection_package(
-            out_path=out_path, include_media=include_media, legacy=legacy
-        )
+        try:
+            self._backend.export_collection_package(
+                out_path=out_path, include_media=include_media, legacy=legacy
+            )
+        finally:
+            self.reopen()
 
     def import_anki_package(
         self, request: ImportAnkiPackageRequest