Add option to update all cards from the same subtitle line

[thntx]

Summary

• Adds a new toggle in Mining Settings: "Update all cards from the same subtitle line"
• When enabled, the "update last card" action also updates audio, image, source, and URL fields on other recently-created cards whose sentence matches the current subtitle line
• Useful when mining multiple words from the same subtitle — all cards get the same screenshot and audio, not just the last one

Details

• New updateLastCardForSameSubtitle setting (default: off)
• New updateLastForSameLine export mode that extends updateLast
• Walks backwards through recent notes (last 2 days to handle Anki's day boundary), stops at the first note whose sentence doesn't match
• Only updates asbplayer-provided fields (audio, image, source, URL), preserving card-specific fields (word, definition, etc.)

Test plan

• Enable the setting in Mining Settings
• Mine multiple words from the same subtitle line
• Use "update last card" — verify all cards from that line get updated with screenshot and audio
• Verify cards from different subtitle lines are not affected
• Verify the setting defaults to off and existing behavior is unchanged when disabled

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