feat: Migrate ESLint to flat config and resolve initial linting errors

Migrated the ESLint configuration to the new flat config format ()
and addressed several initial linting errors.

Key changes include:
- Updated ESLint configuration to treat  as warnings instead of errors.
- Fixed  errors in  by declaring  and .
- Corrected  error in  by using  instead of an out-of-scope .
- Resolved  error in  by replacing the undefined  directive with the  component.
- Addressed  errors in  by replacing  with  and  with .
- Fixed  errors in  by importing necessary modules (, , ) and adding missing props (, , , , ).

OLD_README_guidelines_v1.md

@@ -1,13 +1,17 @@
 # One Sky IT's Aether App - UI and UX Guidelines and Rules
 
-
 ## General
+
 ### Events
+
 #### layout header
+
 #### layout footer
 
 ### Journals
+
 #### buttons
+
 ##### alert
 
 ##### info
@@ -15,52 +19,62 @@
 ##### priority, flag
 
 ##### warning, hide
+
 ```css
 variant-soft-warning hover:variant-filled-warning
 ```
+
 ##### error, delete, disable
+
 ```css
 variant-soft-error hover:variant-filled-error
 ```
+
 #### new root layout header
+
 #### submenu
+
 ```css
 flex flex-row items-center justify-center gap-1
 ```
-#### new layout footer
 
+#### new layout footer
 
 ## Svelte 5 and SvelteKit v2 (framework and routing)
 
-
 ## Tailwind 3.x CSS (styles)
-Waiting to upgrade to 4.x when ShadCN is ready. ShadCN is still being worked on as of late March 2025.
-* https://ui.shadcn.com/docs/tailwind-v4
 
+Waiting to upgrade to 4.x when ShadCN is ready. ShadCN is still being worked on as of late March 2025.
+
+- https://ui.shadcn.com/docs/tailwind-v4
 
 ## CodeMirror 6.x (text and code editor)
-* https://codemirror.net
+
+- https://codemirror.net
 
 ## ShadCN (Tailwind Components)
-* https://ui.shadcn.com/docs
-* https://github.com/shadcn-ui/ui
 
+- https://ui.shadcn.com/docs
+- https://github.com/shadcn-ui/ui
 
 ## Skeleton (Design System, Tailwind Components, Functional Components)
+
 Waiting to upgrade to Skeleton v3. Mostly because of the Tailwind 4.x upgrade needed for ShadCN.
-* https://www.skeleton.dev/docs/get-started/migrate-from-v2
+
+- https://www.skeleton.dev/docs/get-started/migrate-from-v2
 
 ## Flowbite (Tailwind Components)
 
-
 ## Lucide Icons (SVG Icons)
-* https://lucide.dev/icons/
 
+- https://lucide.dev/icons/
 
 ## Markdown
-Using marked for Markdown parsing.
-* https://marked.js.org/
 
+Using marked for Markdown parsing.
+
+- https://marked.js.org/
 
 ## Edra (TipTap based Rich Text Editor)
-* https://edra.tsuzat.com/
+
+- https://edra.tsuzat.com/