feat: forum rich-text editor, emoji picker, mentions, discover nav, feed, uploads, profile

Forum:
- TipTap WYSIWYG editor with full toolbar
- @emoji-mart/react emoji picker (consistent with tweets)
- @mention autocomplete with user search API
- Fix PHP 8.4 parse errors in Blade templates
- Fix thread data display (paginator items)
- Align forum page widths to max-w-5xl

Discover:
- Extract shared _nav.blade.php partial
- Add missing nav links to for-you page
- Add Following link for authenticated users

Feed/Posts:
- Post model, controllers, policies, migrations
- Feed page components (PostComposer, FeedCard, etc)
- Post reactions, comments, saves, reports, sharing
- Scheduled publishing support
- Link preview controller

Profile:
- Profile page components (ProfileHero, ProfileTabs)
- Profile API controller

Uploads:
- Upload wizard enhancements
- Scheduled publish picker
- Studio status bar and readiness checklist

app/Services/Uploads/UploadDerivativesService.php

@@ -27,34 +27,81 @@ final class UploadDerivativesService
         }
     }
 
-    public function storeOriginal(string $sourcePath, string $hash): string
+    public function storeOriginal(string $sourcePath, string $hash, ?string $originalFileName = null): string
     {
         $this->assertImageAvailable();
+        // Preserve original file extension and store with filename = <hash>.<ext>
+        $dir = $this->storage->ensureHashDirectory('original', $hash);
 
-        $dir = $this->storage->ensureHashDirectory('originals', $hash);
-        $target = $dir . DIRECTORY_SEPARATOR . 'orig.webp';
-        $quality = (int) config('uploads.quality', 85);
+        $origExt = $this->resolveOriginalExtension($sourcePath, $originalFileName);
+        $target = $dir . DIRECTORY_SEPARATOR . $hash . ($origExt !== '' ? '.' . $origExt : '');
 
-        /** @var InterventionImageInterface $img */
-        $img = $this->manager->read($sourcePath);
-        $encoder = new \Intervention\Image\Encoders\WebpEncoder($quality);
-        $encoded = (string) $img->encode($encoder);
-        File::put($target, $encoded);
+        // Try a direct copy first (works for images and archives). If that fails,
+        // fall back to re-encoding image to webp as a last resort.
+        try {
+            if (! File::copy($sourcePath, $target)) {
+                throw new \RuntimeException('Copy failed');
+            }
+        } catch (\Throwable $e) {
+            // Fallback: encode to webp
+            $quality = (int) config('uploads.quality', 85);
+            /** @var InterventionImageInterface $img */
+            $img = $this->manager->read($sourcePath);
+            $encoder = new \Intervention\Image\Encoders\WebpEncoder($quality);
+            $encoded = (string) $img->encode($encoder);
+            $target = $dir . DIRECTORY_SEPARATOR . $hash . '.webp';
+            File::put($target, $encoded);
+        }
 
         return $target;
     }
 
+    private function resolveOriginalExtension(string $sourcePath, ?string $originalFileName): string
+    {
+        $fromClientName = strtolower((string) pathinfo((string) $originalFileName, PATHINFO_EXTENSION));
+        if ($fromClientName !== '' && preg_match('/^[a-z0-9]{1,12}$/', $fromClientName) === 1) {
+            return $fromClientName;
+        }
+
+        $fromSource = strtolower((string) pathinfo($sourcePath, PATHINFO_EXTENSION));
+        if ($fromSource !== '' && $fromSource !== 'upload' && preg_match('/^[a-z0-9]{1,12}$/', $fromSource) === 1) {
+            return $fromSource;
+        }
+
+        $mime = File::exists($sourcePath) ? (string) (File::mimeType($sourcePath) ?? '') : '';
+        return $this->extensionFromMime($mime);
+    }
+
+    private function extensionFromMime(string $mime): string
+    {
+        return match (strtolower($mime)) {
+            'image/jpeg', 'image/jpg' => 'jpg',
+            'image/png' => 'png',
+            'image/webp' => 'webp',
+            'image/gif' => 'gif',
+            'image/bmp' => 'bmp',
+            'image/tiff' => 'tif',
+            'application/zip', 'application/x-zip-compressed' => 'zip',
+            'application/x-rar-compressed', 'application/vnd.rar' => 'rar',
+            'application/x-7z-compressed' => '7z',
+            'application/x-tar' => 'tar',
+            'application/gzip', 'application/x-gzip' => 'gz',
+            default => 'bin',
+        };
+    }
+
     public function generatePublicDerivatives(string $sourcePath, string $hash): array
     {
         $this->assertImageAvailable();
         $quality = (int) config('uploads.quality', 85);
         $variants = (array) config('uploads.derivatives', []);
-        $dir = $this->storage->publicHashDirectory($hash);
         $written = [];
 
         foreach ($variants as $variant => $options) {
             $variant = (string) $variant;
-            $path = $dir . DIRECTORY_SEPARATOR . $variant . '.webp';
+            $dir = $this->storage->ensureHashDirectory($variant, $hash);
+            // store derivative filename as <hash>.webp per variant directory
+            $path = $dir . DIRECTORY_SEPARATOR . $hash . '.webp';
 
             /** @var InterventionImageInterface $img */
             $img = $this->manager->read($sourcePath);

app/Services/Uploads/UploadPipelineService.php

@@ -104,20 +104,22 @@ final class UploadPipelineService
         return $result;
     }
 
-    public function processAndPublish(string $sessionId, string $hash, int $artworkId): array
+    public function processAndPublish(string $sessionId, string $hash, int $artworkId, ?string $originalFileName = null): array
     {
         $session = $this->sessions->getOrFail($sessionId);
 
-        $originalPath = $this->derivatives->storeOriginal($session->tempPath, $hash);
-        $originalRelative = $this->storage->sectionRelativePath('originals', $hash, 'orig.webp');
-        $this->artworkFiles->upsert($artworkId, 'orig', $originalRelative, 'image/webp', (int) filesize($originalPath));
+        $originalPath = $this->derivatives->storeOriginal($session->tempPath, $hash, $originalFileName);
+        $origFilename = basename($originalPath);
+        $originalRelative = $this->storage->sectionRelativePath('original', $hash, $origFilename);
+        $origMime = File::exists($originalPath) ? File::mimeType($originalPath) : 'application/octet-stream';
+        $this->artworkFiles->upsert($artworkId, 'orig', $originalRelative, $origMime, (int) filesize($originalPath));
 
         $publicAbsolute = $this->derivatives->generatePublicDerivatives($session->tempPath, $hash);
         $publicRelative = [];
 
         foreach ($publicAbsolute as $variant => $absolutePath) {
-            $filename = $variant . '.webp';
-            $relativePath = $this->storage->publicRelativePath($hash, $filename);
+            $filename = $hash . '.webp';
+            $relativePath = $this->storage->sectionRelativePath($variant, $hash, $filename);
             $this->artworkFiles->upsert($artworkId, $variant, $relativePath, 'image/webp', (int) filesize($absolutePath));
             $publicRelative[$variant] = $relativePath;
         }
@@ -126,13 +128,14 @@ final class UploadPipelineService
         $width = is_array($dimensions) && isset($dimensions[0]) ? (int) $dimensions[0] : 1;
         $height = is_array($dimensions) && isset($dimensions[1]) ? (int) $dimensions[1] : 1;
 
+        $origExt = strtolower(pathinfo($originalPath, PATHINFO_EXTENSION) ?: '');
         Artwork::query()->whereKey($artworkId)->update([
-            'file_name' => basename($originalRelative),
+            'file_name' => $origFilename,
             'file_path' => '',
             'file_size' => (int) filesize($originalPath),
-            'mime_type' => 'image/webp',
+            'mime_type' => $origMime,
             'hash' => $hash,
-            'file_ext' => 'webp',
+            'file_ext' => $origExt,
             'thumb_ext' => 'webp',
             'width' => max(1, $width),
             'height' => max(1, $height),
@@ -152,6 +155,11 @@ final class UploadPipelineService
         ];
     }
 
+    public function originalHashExists(string $hash): bool
+    {
+        return $this->storage->originalHashExists($hash);
+    }
+
     private function quarantine(UploadSessionData $session, string $reason): void
     {
         $newPath = $this->storage->moveToSection($session->tempPath, 'quarantine');

app/Services/Uploads/UploadStorageService.php

@@ -76,33 +76,6 @@ final class UploadStorageService
         return $dir;
     }
 
-    public function publicHashDirectory(string $hash): string
-    {
-        $prefix = trim((string) config('uploads.public_img_prefix', 'img'), DIRECTORY_SEPARATOR);
-        $base = $this->sectionPath('public') . DIRECTORY_SEPARATOR . $prefix;
-
-        if (! File::exists($base)) {
-            File::makeDirectory($base, 0755, true);
-        }
-
-        $segments = $this->hashSegments($hash);
-        $dir = $base . DIRECTORY_SEPARATOR . implode(DIRECTORY_SEPARATOR, $segments);
-
-        if (! File::exists($dir)) {
-            File::makeDirectory($dir, 0755, true);
-        }
-
-        return $dir;
-    }
-
-    public function publicRelativePath(string $hash, string $filename): string
-    {
-        $prefix = trim((string) config('uploads.public_img_prefix', 'img'), DIRECTORY_SEPARATOR);
-        $segments = $this->hashSegments($hash);
-
-        return $prefix . '/' . implode('/', $segments) . '/' . ltrim($filename, '/');
-    }
-
     public function sectionRelativePath(string $section, string $hash, string $filename): string
     {
         $segments = $this->hashSegments($hash);
@@ -111,6 +84,24 @@ final class UploadStorageService
         return $section . '/' . implode('/', $segments) . '/' . ltrim($filename, '/');
     }
 
+    public function originalHashExists(string $hash): bool
+    {
+        $segments = $this->hashSegments($hash);
+        $dir = $this->sectionPath('original') . DIRECTORY_SEPARATOR . implode(DIRECTORY_SEPARATOR, $segments);
+
+        if (! File::isDirectory($dir)) {
+            return false;
+        }
+
+        $normalizedHash = strtolower(preg_replace('/[^a-z0-9]/', '', $hash) ?? '');
+        if ($normalizedHash === '') {
+            return false;
+        }
+
+        $matches = File::glob($dir . DIRECTORY_SEPARATOR . $normalizedHash . '.*');
+        return is_array($matches) && count($matches) > 0;
+    }
+
     private function safeExtension(UploadedFile $file): string
     {
         $extension = (string) $file->guessExtension();
@@ -125,10 +116,11 @@ final class UploadStorageService
         $hash = preg_replace('/[^a-z0-9]/', '', $hash) ?? '';
         $hash = str_pad($hash, 6, '0');
 
+        // Use two 2-char segments for directory sharding: first two chars, next two chars.
+        // Result: <section>/<aa>/<bb>/<filename>
         $segments = [
             substr($hash, 0, 2),
             substr($hash, 2, 2),
-            substr($hash, 4, 2),
         ];
 
         return array_map(static fn (string $part): string => $part === '' ? '00' : $part, $segments);