Merge pull request 'fix: share-residence import preview polish (closes #7)' (#9) from fix/7-share-residence-import-polish into master

Reviewed-on: #9

composeApp/src/commonMain/kotlin/com/tt/honeyDue/models/HoneyDueShareCodec.kt

@@ -59,12 +59,29 @@ object HoneyDueShareCodec {
 
     /**
      * Build a filesystem-safe package filename with `.honeydue` extension.
+     *
+     * Strips only the characters that are actually unsafe on iOS / Android
+     * filesystems (`/`, `\`, `:`, `*`, `?`, `"`, `<`, `>`, `|`, control
+     * chars). Spaces and apostrophes are kept intact so the recipient sees
+     * the original residence / contractor name in the iOS QuickLook title
+     * bar — gitea#7 called out the previous behaviour rendering
+     * "The_Tartt's" instead of "The Tartt's". Internal whitespace is
+     * collapsed to single spaces and trimmed; falls back to "honeyDue" if
+     * the input is blank after sanitising.
      */
     fun safeShareFileName(displayName: String): String {
         val safeName = displayName
-            .replace(" ", "_")
-            .replace("/", "-")
+            // Keep whitespace through the filter so adjacent space+tab
+            // sequences survive to the regex-collapse step below. Drop
+            // only non-whitespace control chars (NUL etc.) plus the
+            // explicit filesystem-unsafe set.
+            .filter { it !in UNSAFE_FILENAME_CHARS && (it.isWhitespace() || !it.isISOControl()) }
+            .replace(Regex("\\s+"), " ")
+            .trim()
             .take(50)
+            .ifBlank { "honeyDue" }
         return "$safeName.honeydue"
     }
+
+    private val UNSAFE_FILENAME_CHARS = setOf('/', '\\', ':', '*', '?', '"', '<', '>', '|')
 }