feat(swimlane): add swimlane engine with first version on SharedWithMe section

added group by:

        - None (= ordered by folders/file name)
        - Type (Folder first, then Image, Vidao, Audio, Document, etc...)
        - Owner
        - Size (With logarithmic groups))
        - Shared date (with groups: today, last 7 days, last 30 days, then year)

migrations/20260527000001_files_category_order.sql

@@ -0,0 +1,83 @@
+-- ── storage.files: pre-computed category_order ──────────────────────────────
+-- Stores a numeric sort bucket derived from the file's mime_type so that
+-- GROUP-BY-TYPE queries in the grants engine can ORDER BY an indexed integer
+-- instead of evaluating a long CASE WHEN mime_type LIKE '…' chain at runtime.
+--
+-- Values are sparse multiples of 100 so future categories can be inserted
+-- between existing ones without renumbering (e.g. "RichText" = 550).
+-- Folder rows live in storage.folders and are not affected; the SQL query
+-- hard-codes 0 for them.
+--
+-- Mapping (mirrors category_order_for() in display_helpers.rs):
+--   0     → Folder  (SQL-only constant, not stored)
+--   100   → Image
+--   200   → Video
+--   300   → Audio
+--   400   → PDF
+--   500   → Document
+--   600   → Spreadsheet
+--   700   → Presentation
+--   800   → Archive
+--   900   → Code
+--   1000  → Markdown
+--   1100  → Text
+--   1200  → Installer
+--   9999  → Other (default)
+
+ALTER TABLE storage.files
+    ADD COLUMN IF NOT EXISTS category_order SMALLINT NOT NULL DEFAULT 9999;
+
+-- Backfill existing rows.  The CASE mirrors category_for() + category_order_for().
+UPDATE storage.files
+SET category_order = CASE
+    -- Image
+    WHEN mime_type LIKE 'image/%'                                                       THEN 100
+    -- Video
+    WHEN mime_type LIKE 'video/%'                                                       THEN 200
+    -- Audio
+    WHEN mime_type LIKE 'audio/%'                                                       THEN 300
+    -- PDF
+    WHEN mime_type = 'application/pdf'                                                  THEN 400
+    -- Document
+    WHEN mime_type IN (
+        'application/msword',
+        'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
+        'application/vnd.oasis.opendocument.text',
+        'application/rtf')                                                              THEN 500
+    -- Spreadsheet
+    WHEN mime_type IN (
+        'application/vnd.ms-excel',
+        'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+        'application/vnd.oasis.opendocument.spreadsheet',
+        'text/csv')                                                                     THEN 600
+    -- Presentation
+    WHEN mime_type IN (
+        'application/vnd.ms-powerpoint',
+        'application/vnd.openxmlformats-officedocument.presentationml.presentation',
+        'application/vnd.oasis.opendocument.presentation')                             THEN 700
+    -- Archive
+    WHEN mime_type IN (
+        'application/zip', 'application/x-rar-compressed', 'application/vnd.rar',
+        'application/x-7z-compressed', 'application/gzip', 'application/x-tar')       THEN 800
+    -- Code (application/* and text/x-* variants)
+    WHEN mime_type IN (
+        'application/json', 'application/javascript', 'application/typescript',
+        'application/xml',  'application/sql',
+        'application/x-sh', 'application/x-shellscript')
+      OR mime_type LIKE 'text/x-%'
+      OR mime_type LIKE 'text/html%'
+      OR mime_type = 'text/css'                                                        THEN 900
+    -- Markdown
+    WHEN mime_type LIKE 'text/markdown%'                                               THEN 1000
+    -- Text (generic)
+    WHEN mime_type LIKE 'text/%'                                                       THEN 1100
+    -- Installer / disk image
+    WHEN mime_type IN (
+        'application/x-apple-diskimage', 'application/x-ms-dos-executable',
+        'application/x-msdownload',      'application/x-msi')                         THEN 1200
+    -- Everything else → Other
+    ELSE 9999
+END;
+
+-- Index so ORDER BY category_order is a fast index scan, not a table sort.
+CREATE INDEX IF NOT EXISTS idx_files_category_order ON storage.files (category_order);