feat: Add comprehensive edit screen to new listing wizard

- Replace individual state structs with unified ListingDraft struct
- Add EditingListing state with field selection interface
- Implement individual field editing states (Title, Description, Price, Slots, StartTime, Duration)
- Add field-specific keyboards with Back buttons and Clear functionality for description
- Update all handlers to use ListingDraft instead of separate state structs
- Rename Confirming to ViewingDraft for clarity
- Add proper validation and error handling for all field edits
- Enable seamless navigation between edit screen and confirmation
- Maintain all existing functionality while adding edit capabilities

Cargo.toml

@@ -13,13 +13,17 @@ sqlx = { version = "0.8.6", features = [
     "macros",
     "rust_decimal",
 ] }
-rust_decimal = { version = "1.33", features = ["serde"] }
-chrono = { version = "0.4", features = ["serde"] }
-serde = { version = "1.0", features = ["derive"] }
+rust_decimal = { version = "1.33" }
+chrono = { version = "0.4" }
 log = "0.4"
 env_logger = "0.11.8"
 anyhow = "1.0"
 dotenvy = "0.15"
+lazy_static = "1.4"
+serde = "1.0.219"
+futures = "0.3.31"
+thiserror = "2.0.16"
+teloxide-core = "0.13.0"
 
 [dev-dependencies]
 rstest = "0.26.1"