Extra diff markers included in notification tokens if one of the text filtering line filters is unselected

[navels]

Describe the bug
If any of these text filtering options are unchecked:

• Added lines
• Replaced/changed lines
• Removed lines

then the {{ current_snapshot }} token has diff markers and {{ diff_full }} has extra diff markers, etc.

Version
v0.52.9

How did you install?
Docker

To Reproduce

1. Set up a random number watch on https://www.random.org/integers/?num=1&min=1&max=100&col=5&base=10&format=plain&rnd=new
2. With a notification configured with body {{ current_snapshot }}
3. Under Text filtering: "Replaced/changed" checked, "Added lines" unchecked, "Removed lines" unchecked.
4. Run the watch.

Here is a share link for this config: https://changedetection.io/share/f7vzWilE2OEa

Expected behavior
Notification body should be a single number

Actual behavior
Notification body is in diff format, e.g.,

(changed) 73
(into) 100

Desktop (please complete the following information):

• OS: Mac OS Tahoe 26.2
• Browser Chrome
• Version 144.0.7559.97

[navels]

Root cause: when a diff filter option is unchecked, snapshots are saved using render_diff with include_change_type_prefix=False to produce clean output. This works for line-level diffs, but the word-level diff function render_inline_word_diff doesn't accept this parameter and always adds placemarkers. These placemarkers get converted to "(changed)", "(into)", etc. when the snapshot is later used in notifications.

[dgtlmoon]

Maybe also related #3561