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Build me a highlight store with a daily review. Import is the hard part; treat it that way.

STACK
- Astro with a Node adapter, SQLite via better-sqlite3
- A bookmarklet and a share target for saving articles

IMPORT
- Kindle: parse My Clippings.txt, which is malformed in several documented ways — handle the duplicate-with-different-whitespace case explicitly
- Web: fetch the page and run Mozilla Readability to get clean text, keeping the original HTML too
- Podcasts: accept a transcript file; do not attempt to transcribe here

DEDUPLICATION, THE REASON THIS GETS MESSY
- A highlight is identified by book plus normalised text plus location, not by an id
- Normalise whitespace, quotes and dashes before comparing
- An extended highlight — same start, longer text — replaces the shorter one and records that it did

THE REVIEW
- A daily set chosen by a simple spaced schedule: 1, 3, 7, 21, 60 days, reset on a manual mark
- Delivered as one email or one page, never a notification stream
- Every review recorded, so the schedule is reconstructible

SYNC OUT
- Export to Markdown, one file per source, with stable filenames so a note app can watch the folder
- Never rewrite a file whose content has not changed

Include a README on the Kindle parsing quirks, the deduplication rule and the review schedule.