fix(buffers): slugify db name for buffer matching and generation

Database names with spaces (or other special characters) caused buffer
recovery and custom buffer name generation to fail because the raw name
was used in regex matching and path construction, while buffer filenames
are generated via slug(). Since slug() is identity for names without
special characters, this change has no effect on existing users.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: axeldetlofsson

autoload/db_ui.vim

@@ -237,7 +237,8 @@ function! s:dbui.generate_new_db_entry(db) abort
   if !empty(self.save_path)
     let save_path = printf('%s/%s', self.save_path, a:db.name)
   endif
-  let buffers = filter(copy(self.old_buffers), 'fnamemodify(v:val, ":e") =~? "^".a:db.name."-" || fnamemodify(v:val, ":t") =~? "^".a:db.name."-"')
+  let db_name_slug = db_ui#utils#slug(a:db.name)
+  let buffers = filter(copy(self.old_buffers), 'fnamemodify(v:val, ":e") =~? "^".db_name_slug."-" || fnamemodify(v:val, ":t") =~? "^".db_name_slug."-"')
 
   let db = {
         \ 'url': a:db.url,

autoload/db_ui/query.vim

@@ -53,7 +53,7 @@ function! s:query.generate_buffer_name(db, opts) abort
   let buffer_name = db_ui#utils#slug(printf('%s-%s', a:db.name, suffix))
   let buffer_name = printf('%s-%s', buffer_name, time)
   if type(g:Db_ui_buffer_name_generator) ==? type(function('tr'))
-    let buffer_name = printf('%s-%s', a:db.name, call(g:Db_ui_buffer_name_generator, [a:opts]))
+    let buffer_name = printf('%s-%s', db_ui#utils#slug(a:db.name), call(g:Db_ui_buffer_name_generator, [a:opts]))
   endif
 
   if !empty(self.drawer.dbui.tmp_location)