style(project): format Go with gofmt, set up Prettier for the frontend

Run gofmt -w across the backend, normalising the manually-aligned := blocks
to the gofmt standard. No code behaviour changes.

Add Prettier (+ prettier-plugin-svelte) to the frontend with the SvelteKit
default config (tabs, single quotes) so formatting is reproducible, then run
it over the whole tree. Add format / format:check npm scripts and a
.prettierignore (build output, generated schema.ts, static assets).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/internal/db/postgres/category_repo.go

@@ -300,4 +300,4 @@ func (r *CategoryRepo) Delete(ctx context.Context, id uuid.UUID) error {
 		return domain.ErrNotFound
 	}
 	return nil
-}
+}

backend/internal/db/postgres/file_repo.go

@@ -142,7 +142,7 @@ func makeCursor(r fileRow, sort, order string) fileCursor {
 		}
 	case "mime":
 		val = r.MIMEType
-	// "created": val is empty; f.id is the sort key.
+		// "created": val is empty; f.id is the sort key.
 	}
 	return fileCursor{Sort: sort, Order: order, ID: r.ID.String(), Val: val}
 }
@@ -569,7 +569,7 @@ func (r *FileRepo) List(ctx context.Context, params domain.FileListParams) (*dom
 			cursorVal = av.OriginalName
 		case "mime":
 			cursorVal = av.MIMEType
-		// "created": cursorVal stays ""; cursorID is the sort key.
+			// "created": cursorVal stays ""; cursorID is the sort key.
 		}
 		hasCursor = true
 		isAnchor = true

backend/internal/db/postgres/filter_parser.go

@@ -15,7 +15,7 @@ import (
 type filterTokenKind int
 
 const (
-	ftkAnd       filterTokenKind = iota
+	ftkAnd filterTokenKind = iota
 	ftkOr
 	ftkNot
 	ftkLParen
@@ -44,9 +44,9 @@ type filterNode interface {
 	toSQL(n int, args []any) (string, int, []any)
 }
 
-type andNode  struct{ left, right filterNode }
-type orNode   struct{ left, right filterNode }
-type notNode  struct{ child filterNode }
+type andNode struct{ left, right filterNode }
+type orNode struct{ left, right filterNode }
+type notNode struct{ child filterNode }
 type leafNode struct{ tok filterToken }
 
 func (a *andNode) toSQL(n int, args []any) (string, int, []any) {

backend/internal/db/postgres/pool_repo.go

@@ -712,4 +712,4 @@ func (r *PoolRepo) Reorder(ctx context.Context, poolID uuid.UUID, fileIDs []uuid
 	}
 
 	return r.reassignPositions(ctx, q, poolID, ordered)
-}
+}

backend/internal/db/postgres/tag_repo.go

@@ -23,16 +23,16 @@ import (
 
 type tagRow struct {
 	ID            uuid.UUID  `db:"id"`
-	Name          string      `db:"name"`
-	Notes         *string     `db:"notes"`
-	Color         *string     `db:"color"`
+	Name          string     `db:"name"`
+	Notes         *string    `db:"notes"`
+	Color         *string    `db:"color"`
 	CategoryID    *uuid.UUID `db:"category_id"`
-	CategoryName  *string     `db:"category_name"`
-	CategoryColor *string     `db:"category_color"`
-	Metadata      []byte      `db:"metadata"`
-	CreatorID     int16       `db:"creator_id"`
-	CreatorName   string      `db:"creator_name"`
-	IsPublic      bool        `db:"is_public"`
+	CategoryName  *string    `db:"category_name"`
+	CategoryColor *string    `db:"category_color"`
+	Metadata      []byte     `db:"metadata"`
+	CreatorID     int16      `db:"creator_id"`
+	CreatorName   string     `db:"creator_name"`
+	IsPublic      bool       `db:"is_public"`
 }
 
 type tagRowWithTotal struct {
@@ -43,8 +43,8 @@ type tagRowWithTotal struct {
 type tagRuleRow struct {
 	WhenTagID   uuid.UUID `db:"when_tag_id"`
 	ThenTagID   uuid.UUID `db:"then_tag_id"`
-	ThenTagName string     `db:"then_tag_name"`
-	IsActive    bool       `db:"is_active"`
+	ThenTagName string    `db:"then_tag_name"`
+	IsActive    bool      `db:"is_active"`
 }
 
 // ---------------------------------------------------------------------------
@@ -637,4 +637,4 @@ WHERE when_tag_id = $1 AND then_tag_id = $2`
 		return domain.ErrNotFound
 	}
 	return nil
-}
+}