Refactor styles and implement new canvas viewport

- Updated styles in `styles.rs` to include new pane and canvas backgrounds, while marking unused functions with `#[allow(dead_code)]`.
- Modified `text_editor.rs` to suppress warnings for unused function parameters.
- Enhanced `title_bar.rs` to create a unified title/menu bar with improved hover states and draggable functionality.
- Simplified `sidebar.rs` to always use a single-column layout and improved tool button styling with hover feedback.
- Added a new `viewport.rs` file to implement a custom canvas viewport widget for zoom and pan rendering, replacing the previous layout-based approach.
- Updated theme management in `theme.rs` to suppress warnings for unused methods.
- Adjusted line count report to reflect recent changes in codebase.

line_count_report.txt

@@ -2,11 +2,11 @@
 SATIR SAYISI RAPORU
 Proje: HCIE-Rust v4
 Konum: /mnt/extra/00_PROJECTS/hcie-rust-v3.05
-Tarih: 2026-07-11 15:12:11
+Tarih: 2026-07-11 20:24:42
 =========================================
 
 -----------------------------------------
-  RUST (.rs) — hcie-* dizinleri (her paket)
+  RUST (.rs) — hcie-* dizinleri (her paket, inkl. hcie-fx, hcie-psd, hcie-kra, hcie-native)
 -----------------------------------------
   hcie-ai                     2402 satır
   hcie-blend                   530 satır
@@ -21,7 +21,7 @@ Tarih: 2026-07-11 15:12:11
   hcie-filter                 3238 satır
   hcie-fx                     4077 satır
   hcie-history                 100 satır
-  hcie-iced-app               4261 satır
+  hcie-iced-app               6308 satır
   hcie-io                    11382 satır
   hcie-kra                    1392 satır
   hcie-native                  153 satır
@@ -34,7 +34,7 @@ Tarih: 2026-07-11 15:12:11
   hcie-vector                 2298 satır
   hcie-vision                 3131 satır
 
-  TOPLAM RUST:               95854 satır
+  TOPLAM RUST:               97901 satır
 
 -----------------------------------------
   C++ / HEADER (.cpp, .h)
@@ -102,14 +102,14 @@ Tarih: 2026-07-11 15:12:11
 
   MARKDOWN (.md)
   --------------------------------
-  (kök dizin)               10777 satır
+  (kök dizin)               10994 satır
 
-  TOPLAM MARKDOWN:           10777 satır
+  TOPLAM MARKDOWN:           10994 satır
 
 =========================================
   KOD SATIRLARI TOPLAMI (GRAND TOTAL)
 =========================================
-  Rust:                      95854 satır
+  Rust:                      97901 satır
   C++ / Header:               5031 satır
   JavaScript:                    0 satır
   Svelte:                        0 satır
@@ -119,9 +119,9 @@ Tarih: 2026-07-11 15:12:11
   CSS:                           0 satır
   Shell Script:               1445 satır
 -----------------------------------------
-  KOD TOPLAMI:              104597 satır
+  KOD TOPLAMI:              106644 satır
 
-  RUST + C++/H TOPLAMI:     100885 satır
+  RUST + C++/H TOPLAMI:     102932 satır
 
   (JSON ve Markdown dosyaları yukarıda ayrı olarak gösterilmiştir)
 =========================================