Edit Book Name allows for "." but will remove anything after it after a sync

[LeviXIII]

Current Behaviour

If I write something like 1. New Items, if I save then it saves ok. But, if I sync, then the edited book name becomes "1".

Acceptance Criteria

• There needs to be a warning that let's users know that "." are not a welcome character to use and that dashes or underscores are.
• We shouldn't let them save if there is a "." (or other special characters) in the name.
• Syncing should be performed as normal and the given book name should be the same as before syncing

Test Checklist

Acceptance Criteria 1: Warning for invalid characters

• Typing a . in the book name field surfaces a visible warning
• Warning text mentions that . is not allowed
• Warning text recommends using dashes (-) or underscores (_) as alternatives
• Warning appears immediately on input (not only after save attempt)
• Warning is dismissed/cleared once the . is removed

Acceptance Criteria 2: Save blocked when name contains a period

• Save button is disabled (or save action is rejected) when name contains .
• Attempting 1. New Items cannot be saved
• Attempting names with . anywhere (start, middle, end, multiple dots) is blocked
• Names without . save successfully (e.g. 1 New Items, 1-New-Items, 1_New_Items)

Acceptance Criteria 3: Sync preserves the book name

• Save a valid edited book name (e.g. 1-New-Items) and run sync
• After sync completes, the book name in the UI matches what was saved
• After sync, the book name in metadata.json matches what was saved
• Close and reopen the project — name persists exactly
• Pull on another machine/clone — synced book name matches the original
• Repeat with names containing dashes, underscores, numbers, and spaces

Regression checks

• Existing books that previously had . in their names (if any) still load without errors
• Default/unedited book names still sync correctly
• Other editable fields are unaffected by the new validation
• No console errors during edit → save → sync flow

Edge cases

• Whitespace-only name still rejected as before
• Empty name still rejected as before
• Pasting a string containing . triggers the same warning and save block
• Trying to bypass via rapid save/sync does not corrupt the name to 1