diff --git a/app/javascript/mastodon/actions/compose_typed.ts b/app/javascript/mastodon/actions/compose_typed.ts
index 310ac5f84dc..2cc4526b828 100644
--- a/app/javascript/mastodon/actions/compose_typed.ts
+++ b/app/javascript/mastodon/actions/compose_typed.ts
@@ -3,24 +3,32 @@ import { defineMessages } from 'react-intl';
 import { createAction } from '@reduxjs/toolkit';
 import type { List as ImmutableList, Map as ImmutableMap } from 'immutable';
 
-import { apiUpdateMedia } from 'mastodon/api/compose';
-import { apiGetSearch } from 'mastodon/api/search';
-import type { ApiMediaAttachmentJSON } from 'mastodon/api_types/media_attachments';
-import type { MediaAttachment } from 'mastodon/models/media_attachment';
+import { apiUpdateMedia } from '@/mastodon/api/compose';
+import { apiGetSearch } from '@/mastodon/api/search';
+import type { ApiMediaAttachmentJSON } from '@/mastodon/api_types/media_attachments';
+import type { ApiQuotePolicy } from '@/mastodon/api_types/quotes';
+import type { MediaAttachment } from '@/mastodon/models/media_attachment';
+import type { Status, StatusVisibility } from '@/mastodon/models/status';
+import type { RootState } from '@/mastodon/store';
 import {
   createDataLoadingThunk,
   createAppThunk,
-} from 'mastodon/store/typed_functions';
+} from '@/mastodon/store/typed_functions';
 
-import type { ApiQuotePolicy } from '../api_types/quotes';
-import type { Status, StatusVisibility } from '../models/status';
-import type { RootState } from '../store';
+import type { ApiStatusJSON } from '../api_types/statuses';
 
 import { showAlert } from './alerts';
-import { changeCompose, focusCompose } from './compose';
+import {
+  changeCompose,
+  focusCompose,
+  submitCompose as submitComposeApi,
+  uploadCompose,
+} from './compose';
 import { importFetchedStatuses } from './importer';
 import { openModal } from './modal';
 
+export const PRIVATE_QUOTE_MODAL_ID = 'quote/private_notify';
+
 const messages = defineMessages({
   quoteErrorEdit: {
     id: 'quote_error.edit',
@@ -159,13 +167,11 @@ export const quoteComposeByStatus = createAppThunk(
     const state = getState();
     const composeState = state.compose;
     const mediaAttachments = composeState.get('media_attachments');
-    // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
-    const wasQuietPostHintModalDismissed: boolean =
-      // eslint-disable-next-line @typescript-eslint/no-unsafe-call, @typescript-eslint/no-unsafe-member-access
-      state.settings.getIn(
-        ['dismissed_banners', 'quote/quiet_post_hint'],
-        false,
-      );
+
+    const wasQuietPostHintModalDismissed = !!state.settings.getIn(
+      ['dismissed_banners', 'quote/quiet_post_hint'],
+      false,
+    );
 
     if (composeState.get('id')) {
       dispatch(showAlert({ message: messages.quoteErrorEdit }));
@@ -278,3 +284,85 @@ export const setComposeQuotePolicy = createAction<ApiQuotePolicy>(
 export const setDragUploadEnabled = createAction<boolean>(
   'compose/setDragUploadEnabled',
 );
+
+export const submitCompose = createAppThunk(
+  (
+    {
+      textareaValue = '',
+      redirectOnSuccess,
+    }: { textareaValue?: string; redirectOnSuccess?: boolean },
+    { getState, dispatch },
+  ) => {
+    if (
+      textareaValue &&
+      (getState().compose.get('text') as string) !== textareaValue
+    ) {
+      dispatch(changeCompose(textareaValue));
+    }
+
+    const { compose, meta, statuses, settings } = getState();
+    const privacy = compose.get('privacy') as StatusVisibility;
+    const missingAltText = (
+      compose.get('media_attachments') as unknown as Immutable.List<
+        Immutable.Map<string, string>
+      >
+    ).some(
+      (media) =>
+        ['image', 'gifv'].includes(media.get('type') ?? '') &&
+        (media.get('description') ?? '').length === 0,
+    );
+    const me = meta.get('me') as string | null;
+    const quotedStatusId = compose.get('quoted_status_id') as string | null;
+    const quoteToPrivate =
+      !!quotedStatusId &&
+      privacy === 'private' &&
+      statuses.getIn([quotedStatusId, 'account']) !== me &&
+      !settings.getIn(['dismissed_banners', PRIVATE_QUOTE_MODAL_ID]);
+
+    if (
+      !!meta.get('missing_alt_text_modal') &&
+      missingAltText &&
+      privacy !== 'direct'
+    ) {
+      dispatch(
+        openModal({
+          modalType: 'CONFIRM_MISSING_ALT_TEXT',
+          modalProps: {},
+        }),
+      );
+    } else if (quoteToPrivate) {
+      dispatch(
+        openModal({
+          modalType: 'CONFIRM_PRIVATE_QUOTE_NOTIFY',
+          modalProps: {},
+        }),
+      );
+    } else {
+      dispatch(
+        submitComposeApi((status: ApiStatusJSON) => {
+          if (redirectOnSuccess) {
+            window.location.assign(status.url);
+          }
+        }),
+      );
+    }
+  },
+);
+
+const urlLikeRegex = /^https?:\/\/[^\s]+\/[^\s]+$/i;
+
+export const processPasteOrDrop = createAppThunk(
+  (transfer: DataTransfer, { dispatch }) => {
+    if (transfer.files.length === 1) {
+      dispatch(uploadCompose(transfer.files));
+    } else if (transfer.files.length === 0) {
+      const data = transfer.getData('text/plain');
+      if (!urlLikeRegex.exec(data)) return;
+
+      try {
+        const url = new URL(data).toString();
+        void dispatch(pasteLinkCompose({ url }));
+      } catch {}
+    }
+  },
+);
diff --git a/app/javascript/mastodon/features/compose/components/language_dropdown.tsx b/app/javascript/mastodon/features/compose/components/language_dropdown.tsx
index c8506905312..ebf577c0587 100644
--- a/app/javascript/mastodon/features/compose/components/language_dropdown.tsx
+++ b/app/javascript/mastodon/features/compose/components/language_dropdown.tsx
@@ -38,7 +38,7 @@ type Language = [string, string, string];
 const getFrequentlyUsedLanguages = createSelector(
   [
     (state: RootState) =>
-      (state.settings as ImmutableMap<string, unknown>).get(
+      state.settings.get(
         'frequentlyUsedLanguages',
         ImmutableMap(),
       ) as ImmutableMap<string, number>,
diff --git a/app/javascript/mastodon/features/compose/containers/compose_form_container.js b/app/javascript/mastodon/features/compose/containers/compose_form_container.js
index c5cffff10d5..f2b1fee849d 100644
--- a/app/javascript/mastodon/features/compose/containers/compose_form_container.js
+++ b/app/javascript/mastodon/features/compose/containers/compose_form_container.js
@@ -10,9 +10,8 @@ import {
   insertEmojiCompose,
   uploadCompose,
 } from 'mastodon/actions/compose';
-import { pasteLinkCompose } from 'mastodon/actions/compose_typed';
+import { pasteLinkCompose, PRIVATE_QUOTE_MODAL_ID } from 'mastodon/actions/compose_typed';
 import { openModal } from 'mastodon/actions/modal';
-import { PRIVATE_QUOTE_MODAL_ID } from 'mastodon/features/ui/components/confirmation_modals/private_quote_notify';
 import { me } from 'mastodon/initial_state';
 
 import ComposeForm from '../components/compose_form';
diff --git a/app/javascript/mastodon/features/compose/index.tsx b/app/javascript/mastodon/features/compose/index.tsx
index 8d9db224701..8d9dc68cbee 100644
--- a/app/javascript/mastodon/features/compose/index.tsx
+++ b/app/javascript/mastodon/features/compose/index.tsx
@@ -52,10 +52,7 @@ const Compose: React.FC<{ multiColumn: boolean }> = ({ multiColumn }) => {
   const intl = useIntl();
   const dispatch = useAppDispatch();
   const columns = useAppSelector(
-    (state) =>
-      (state.settings as ImmutableMap<string, unknown>).get(
-        'columns',
-      ) as ImmutableList<ColumnMap>,
+    (state) => state.settings.get('columns') as ImmutableList<ColumnMap>,
   );
 
   useEffect(() => {
diff --git a/app/javascript/mastodon/features/home_timeline/components/column_settings.tsx b/app/javascript/mastodon/features/home_timeline/components/column_settings.tsx
index 7de82215e4f..6257eae34ff 100644
--- a/app/javascript/mastodon/features/home_timeline/components/column_settings.tsx
+++ b/app/javascript/mastodon/features/home_timeline/components/column_settings.tsx
@@ -1,8 +1,3 @@
-/* eslint-disable @typescript-eslint/no-unsafe-call,
-                  @typescript-eslint/no-unsafe-return,
-                  @typescript-eslint/no-unsafe-assignment,
-                  @typescript-eslint/no-unsafe-member-access
-                  -- the settings store is not yet typed */
 import { useCallback } from 'react';
 
 import { FormattedMessage } from 'react-intl';
diff --git a/app/javascript/mastodon/features/home_timeline/components/inline_follow_suggestions.tsx b/app/javascript/mastodon/features/home_timeline/components/inline_follow_suggestions.tsx
index e48fd19c3bd..2d849b46ffb 100644
--- a/app/javascript/mastodon/features/home_timeline/components/inline_follow_suggestions.tsx
+++ b/app/javascript/mastodon/features/home_timeline/components/inline_follow_suggestions.tsx
@@ -174,9 +174,7 @@ export const InlineFollowSuggestions: React.FC<{ hidden?: boolean }> = ({
   const suggestions = useAppSelector((state) => state.suggestions.items);
   const isLoading = useAppSelector((state) => state.suggestions.isLoading);
   const dismissed = useAppSelector(
-    (state) =>
-      // eslint-disable-next-line @typescript-eslint/no-unsafe-member-access, @typescript-eslint/no-unsafe-call
-      state.settings.getIn(['dismissed_banners', DISMISSIBLE_ID]) as boolean,
+    (state) => !!state.settings.getIn(['dismissed_banners', DISMISSIBLE_ID]),
   );
 
   useEffect(() => {
diff --git a/app/javascript/mastodon/features/notifications/components/column_settings_group.tsx b/app/javascript/mastodon/features/notifications/components/column_settings_group.tsx
index f888488be32..57c8d0ed7eb 100644
--- a/app/javascript/mastodon/features/notifications/components/column_settings_group.tsx
+++ b/app/javascript/mastodon/features/notifications/components/column_settings_group.tsx
@@ -18,9 +18,10 @@ import SettingToggle from './setting_toggle';
 const selectNotificationSettings = createAppSelector(
   [
     (state) =>
-      (state.settings as Immutable.Map<string, unknown>).get(
-        'notifications',
-      ) as Immutable.Map<string, Immutable.Map<string, unknown> | boolean>,
+      state.settings.get('notifications') as Immutable.Map<
+        string,
+        Immutable.Map<string, unknown> | boolean
+      >,
     (state) => state.notifications.get('browserPermission') as string,
     (state) => state.push_notifications,
   ],
diff --git a/app/javascript/mastodon/features/ui/components/columns_area.tsx b/app/javascript/mastodon/features/ui/components/columns_area.tsx
index be91d5dccce..0e0d0884bef 100644
--- a/app/javascript/mastodon/features/ui/components/columns_area.tsx
+++ b/app/javascript/mastodon/features/ui/components/columns_area.tsx
@@ -93,10 +93,8 @@ export const ColumnsArea = forwardRef<
   }
 >(({ children, minimalShell, singleColumn }, ref) => {
   const renderComposePanel = !useBreakpoint('full');
-  const columns = useAppSelector((state) =>
-    (state.settings as Record<{ columns: List<Record<Column>> }>).get(
-      'columns',
-    ),
+  const columns = useAppSelector(
+    (state) => state.settings.get('columns') as List<Record<Column>>,
   );
   const isModalOpen = useAppSelector(
     (state) => !state.modal.get('stack').isEmpty(),
diff --git a/app/javascript/mastodon/features/ui/components/confirmation_modals/private_quote_notify.tsx b/app/javascript/mastodon/features/ui/components/confirmation_modals/private_quote_notify.tsx
index ef917a10270..42fc15b266f 100644
--- a/app/javascript/mastodon/features/ui/components/confirmation_modals/private_quote_notify.tsx
+++ b/app/javascript/mastodon/features/ui/components/confirmation_modals/private_quote_notify.tsx
@@ -3,6 +3,7 @@ import { forwardRef, useCallback, useState } from 'react';
 import { defineMessages, FormattedMessage, useIntl } from 'react-intl';
 
 import { submitCompose } from '@/mastodon/actions/compose';
+import { PRIVATE_QUOTE_MODAL_ID } from '@/mastodon/actions/compose_typed';
 import { changeSetting } from '@/mastodon/actions/settings';
 import { CheckBox } from '@/mastodon/components/check_box';
 import { useAppDispatch } from '@/mastodon/store';
@@ -11,8 +12,6 @@ import { ConfirmationModal } from './confirmation_modal';
 import type { BaseConfirmationModalProps } from './confirmation_modal';
 import classes from './styles.module.css';
 
-export const PRIVATE_QUOTE_MODAL_ID = 'quote/private_notify';
-
 const messages = defineMessages({
   title: {
     id: 'confirmations.private_quote_notify.title',
diff --git a/app/javascript/mastodon/features/ui/components/skip_links/index.tsx b/app/javascript/mastodon/features/ui/components/skip_links/index.tsx
index 7ecff95287c..e5a74ba992b 100644
--- a/app/javascript/mastodon/features/ui/components/skip_links/index.tsx
+++ b/app/javascript/mastodon/features/ui/components/skip_links/index.tsx
@@ -16,7 +16,7 @@ export const SkipLinks: React.FC<{
 }> = ({ multiColumn, onFocusGettingStartedColumn }) => {
   const intl = useIntl();
   const columnCount = useAppSelector((state) => {
-    const settings = state.settings as Immutable.Collection<string, unknown>;
+    const settings = state.settings;
     return (settings.get('columns') as Immutable.Map<number, unknown>).size;
   });
 
diff --git a/app/javascript/mastodon/reducers/settings.js b/app/javascript/mastodon/reducers/settings.js
index c10d3506002..136d57f4a50 100644
--- a/app/javascript/mastodon/reducers/settings.js
+++ b/app/javascript/mastodon/reducers/settings.js
@@ -165,6 +165,7 @@ const updateFrequentLanguages = (state, language) => state.update('frequentlyUse
 
 const filterDeadListColumns = (state, listId) => state.update('columns', columns => columns.filterNot(column => column.get('id') === 'LIST' && column.get('params').get('id') === listId));
 
+/** @type {import('@reduxjs/toolkit').Reducer<ImmutableMap<string, unknown>>} */
 export default function settings(state = initialState, action) {
   switch(action.type) {
   case STORE_HYDRATE:
diff --git a/app/javascript/mastodon/selectors/settings.ts b/app/javascript/mastodon/selectors/settings.ts
index 49e0df0c404..7958c0dd483 100644
--- a/app/javascript/mastodon/selectors/settings.ts
+++ b/app/javascript/mastodon/selectors/settings.ts
@@ -48,7 +48,12 @@ export const selectSettingsNotificationsShowUnread = (state: RootState) =>
   state.settings.getIn(['notifications', 'showUnread']) as boolean;
 
 export const selectNeedsNotificationPermission = (state: RootState) =>
-  (state.settings.getIn(['notifications', 'alerts']).includes(true) &&
+  ((
+    state.settings.getIn(['notifications', 'alerts']) as Immutable.Map<
+      string,
+      boolean
+    >
+  ).includes(true) &&
     state.notifications.get('browserSupport') &&
     state.notifications.get('browserPermission') === 'default' &&
     !state.settings.getIn([