feat(ios): polish onboarding and native sign-in flow (#15217)

## Summary
- Reworks the iOS onboarding, native sign-in, and paywall flow so
first-install and cold-start entry stay native, adaptive, and aligned
with the current login/subscription gates.
- Removes onboarding swipe paging, refines onboarding/paywall layout
behavior, and keeps AI/paywall entry behavior consistent for logged-in
and subscribed users.
- Adds the new mobile all-docs empty states with localized copy and
dialog entry points, and closes the remaining review follow-ups by
removing the onboarding plan artifact and dropping the iOS AI
subscription bypass.

## Test plan
- Built the iOS app for simulator with `xcodebuild -workspace
App.xcworkspace -scheme App -configuration Debug -sdk iphonesimulator
-destination 'generic/platform=iOS Simulator' ARCHS=arm64
ONLY_ACTIVE_ARCH=YES CODE_SIGNING_ALLOWED=NO CODE_SIGNING_REQUIRED=NO
build` during the native onboarding/sign-in flow work.
- Let the repo pre-commit hooks run on the latest follow-up commit
(`prettier` + `eslint --fix`).
- Checked diagnostics for the edited TS/TSX files after the review
follow-up changes.
- Manually iterated on onboarding/native sign-in/paywall UI states in
simulator during implementation.

---------

Co-authored-by: DarkSky <darksky2048@gmail.com>

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

@@ -2,7 +2,7 @@
   "ar": 88,
   "ca": 85,
   "da": 3,
-  "de": 96,
+  "de": 95,
   "el-GR": 84,
   "en": 100,
   "es-AR": 84,
@@ -11,18 +11,18 @@
   "fa": 84,
   "fr": 88,
   "hi": 1,
-  "it": 86,
+  "it": 85,
   "ja": 84,
   "kk": 91,
   "ko": 85,
   "nb-NO": 42,
-  "pl": 86,
+  "pl": 85,
   "pt-BR": 84,
   "ru": 86,
-  "sv-SE": 85,
+  "sv-SE": 84,
   "tr": 91,
   "uk": 84,
   "ur": 91,
   "zh-Hans": 95,
-  "zh-Hant": 87
+  "zh-Hant": 86
 }

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

@@ -8425,6 +8425,42 @@ export function useAFFiNEI18N(): {
       * `Create Collection`
       */
     ["com.affine.m.explorer.collection.new-dialog-title"](): string;
+    /**
+      * `No documents yet`
+      */
+    ["com.affine.m.explorer.empty.docs.title"](): string;
+    /**
+      * `Create your first document to start capturing ideas and organizing knowledge.`
+      */
+    ["com.affine.m.explorer.empty.docs.description"](): string;
+    /**
+      * `New Document`
+      */
+    ["com.affine.m.explorer.empty.docs.action"](): string;
+    /**
+      * `No collections yet`
+      */
+    ["com.affine.m.explorer.empty.collections.title"](): string;
+    /**
+      * `Create a collection to organize related content in one place.`
+      */
+    ["com.affine.m.explorer.empty.collections.description"](): string;
+    /**
+      * `New Collection`
+      */
+    ["com.affine.m.explorer.empty.collections.action"](): string;
+    /**
+      * `No tags yet`
+      */
+    ["com.affine.m.explorer.empty.tags.title"](): string;
+    /**
+      * `Add tags to your documents for easier organization and discovery.`
+      */
+    ["com.affine.m.explorer.empty.tags.description"](): string;
+    /**
+      * `New Tag`
+      */
+    ["com.affine.m.explorer.empty.tags.action"](): string;
     /**
       * `Rename`
       */

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

@@ -2096,6 +2096,15 @@
   "com.affine.m.explorer.collection.rename": "Rename",
   "com.affine.m.explorer.collection.rename-menu-title": "Rename Collection",
   "com.affine.m.explorer.collection.new-dialog-title": "Create Collection",
+  "com.affine.m.explorer.empty.docs.title": "No documents yet",
+  "com.affine.m.explorer.empty.docs.description": "Create your first document to start capturing ideas and organizing knowledge.",
+  "com.affine.m.explorer.empty.docs.action": "New Document",
+  "com.affine.m.explorer.empty.collections.title": "No collections yet",
+  "com.affine.m.explorer.empty.collections.description": "Create a collection to organize related content in one place.",
+  "com.affine.m.explorer.empty.collections.action": "New Collection",
+  "com.affine.m.explorer.empty.tags.title": "No tags yet",
+  "com.affine.m.explorer.empty.tags.description": "Add tags to your documents for easier organization and discovery.",
+  "com.affine.m.explorer.empty.tags.action": "New Tag",
   "com.affine.m.explorer.doc.rename": "Rename",
   "com.affine.m.selector.type-doc": "Doc",
   "com.affine.m.selector.type-tag": "Tag",