fix: narrow bare except blocks to specific exception types (#282)

Replace 6 bare `except:` blocks with targeted exception types:
- logo_downloader.py: OSError for file removal, (OSError, IOError) for font loading
- layout_manager.py: (ValueError, TypeError, KeyError, IndexError) for format string
- app.py: (OSError, ValueError) for CPU temp, (SubprocessError, OSError) for systemctl, (KeyError, TypeError, ValueError) for config parsing

Co-authored-by: 5ymb01 <5ymb01@users.noreply.github.com>
Co-authored-by: 5ymb01 <noreply@github.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

src/layout_manager.py

@@ -238,7 +238,7 @@ class LayoutManager:
         # Format the text
         try:
             text = format_str.format(value=value)
-        except:
+        except (ValueError, TypeError, KeyError, IndexError):
             text = str(value)
         
         self.display_manager.draw_text(text, x, y, color)

src/logo_downloader.py

@@ -237,7 +237,7 @@ class LogoDownloader:
                 logger.error(f"Downloaded file for {team_abbreviation} is not a valid image or conversion failed: {e}")
                 try:
                     os.remove(filepath)  # Remove invalid file
-                except:
+                except OSError:
                     pass
                 return False
             
@@ -642,10 +642,10 @@ class LogoDownloader:
             # Try to load a font, fallback to default
             try:
                 font = ImageFont.truetype("assets/fonts/PressStart2P-Regular.ttf", 12)
-            except:
+            except (OSError, IOError):
                 try:
                     font = ImageFont.load_default()
-                except:
+                except (OSError, IOError):
                     font = None
             
             # Draw team abbreviation