Keep originals on this device, by pin and by use

Fills in `image_cache`, which the previous commit's "On this device" filter
read but nothing wrote. Also carries in-flight work that shared these files:
the Android TLS root store, the settings page, and a regenerated
traceability report.

# Two populations, deliberately separate

An original is kept here for one of two reasons, and conflating them produces
the exact failure the feature exists to prevent.

**Pinned** originals were asked for. Pinning a collection before a trip is a
promise, so pinned rows are never evicted and never counted against the
budget — a cap that could silently delete a pinned trip would make pinning
worthless, because it could not be relied on without checking.

**Passively cached** originals are a side effect of working: develop already
downloads the whole file, so keeping it costs no bandwidth and saves the
entire transfer next time. This population is what the budget bounds, evicted
least-recently-used, because it otherwise grows until a day of culling fills
a disk.

Sharing one budget would let a large pin starve the passive cache, or let
browsing evict a pin. They are separate.

# What was built

`dr_catalog::cache` owns the bookkeeping — held tier, size, last use, pinned
— and writes the bytes; deciding to download stays with the caller, which is
what keeps a crate with no network out of the network's business. Files are
written to a temporary and renamed, so a dropped connection cannot leave a
truncated file recorded as a complete original. They are named by image id,
not filename: `Photos/IMG_0001.CR2` and `Trips/IMG_0001.CR2` are different
photographs, and a flat cache keyed on the name would serve one for the other.

`spawn_full_fetch` became read-through. A hit is a disk read; a miss stores
what it downloads and enforces the budget. A cache that cannot be opened is a
miss, not a failure to open the photograph.

Pinning writes intent — `tier_desired` — without downloading, so the button
responds immediately, and `spawn_pin_fetch` fills it in sequentially
afterwards. Sequential because these are tens of megabytes each: the lanes
that make the thumbnail sweep fast buy little against one connection's
bandwidth and cost a great deal of memory. A pin interrupted by a lost
connection resumes from where it stopped.

Schema v5 adds `pinned` and `path`. `pinned` is a column rather than something
inferred from `pinned_by_rule`, which is ON DELETE SET NULL and so cannot
answer for an image whose rule was deleted. A v4 catalog migrates in place;
existing rows default to unpinned, the safe direction.

The budget and "keep opened originals" come from the settings page rather than
a constant, and are applied at startup rather than only on change — a cache
capped at 2 GB last session would otherwise spend this one filling to the
default. Turning off keeping leaves what is already cached readable: those
bytes are paid for, and refusing them would re-download images sitting right
there, including pinned ones.

Also removes a doubled `#[test]` introduced in the previous commit.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/traceability.md

@@ -9,17 +9,17 @@ Denominators are parsed from [`requirements.md`](requirements.md) at run time, n
 
 | Metric | Value |
 |---|---|
-| Source files scanned | 82 |
-| TRACES tags found | 80 |
+| Source files scanned | 92 |
+| TRACES tags found | 130 |
 | Requirements defined | 149 |
-| Requirements covered | 60 |
-| **Coverage** | **40.3%** (60/149) |
+| Requirements covered | 69 |
+| **Coverage** | **46.3%** (69/149) |
 
 ### By type
 
 | Type | Covered | Defined |
 |---|---|---|
-| FR | 44 | 95 |
+| FR | 53 | 95 |
 | NFR | 14 | 48 |
 | R | 2 | 6 |
 
@@ -33,21 +33,21 @@ A tag naming an ID `requirements.md` does not define — what renumbering produc
 
 | ID | Tagged in |
 |---|---|
-| FR-CAT-1 | [`core/dr-catalog/src/scan.rs:1`](../core/dr-catalog/src/scan.rs#L1), [`core/dr-sync/src/scan.rs:83`](../core/dr-sync/src/scan.rs#L83), [`core/dr-types/src/lib.rs:176`](../core/dr-types/src/lib.rs#L176), [`tools/traceability/src/lib.rs:473`](../tools/traceability/src/lib.rs#L473), [`tools/traceability/src/lib.rs:505`](../tools/traceability/src/lib.rs#L505), [`ui/dr-ui/src/library.rs:1`](../ui/dr-ui/src/library.rs#L1) |
-| FR-CAT-11 | [`ui/dr-ui/src/library.rs:122`](../ui/dr-ui/src/library.rs#L122) |
+| FR-CAT-1 | [`core/dr-catalog/src/scan.rs:1`](../core/dr-catalog/src/scan.rs#L1), [`core/dr-sync/src/scan.rs:93`](../core/dr-sync/src/scan.rs#L93), [`core/dr-types/src/lib.rs:181`](../core/dr-types/src/lib.rs#L181), [`tools/traceability/src/lib.rs:473`](../tools/traceability/src/lib.rs#L473), [`tools/traceability/src/lib.rs:505`](../tools/traceability/src/lib.rs#L505), [`ui/dr-ui/src/library.rs:1`](../ui/dr-ui/src/library.rs#L1) |
+| FR-CAT-11 | [`ui/dr-ui/src/library.rs:138`](../ui/dr-ui/src/library.rs#L138) |
 | FR-CAT-12 | [`core/dr-pipeline/src/sidecar.rs:108`](../core/dr-pipeline/src/sidecar.rs#L108) |
-| FR-CAT-1a | [`core/dr-types/src/lib.rs:38`](../core/dr-types/src/lib.rs#L38) |
+| FR-CAT-1a | [`core/dr-types/src/lib.rs:43`](../core/dr-types/src/lib.rs#L43) |
 | FR-CAT-2 | [`core/dr-catalog/src/lib.rs:1`](../core/dr-catalog/src/lib.rs#L1), [`core/dr-catalog/src/schema.rs:1`](../core/dr-catalog/src/schema.rs#L1), [`tools/traceability/src/lib.rs:473`](../tools/traceability/src/lib.rs#L473) |
-| FR-CAT-3 | [`core/dr-catalog/src/jobs.rs:1`](../core/dr-catalog/src/jobs.rs#L1), [`core/dr-thumbs/src/codec.rs:1`](../core/dr-thumbs/src/codec.rs#L1), [`core/dr-thumbs/src/lib.rs:1`](../core/dr-thumbs/src/lib.rs#L1) |
+| FR-CAT-3 | [`core/dr-catalog/src/jobs.rs:1`](../core/dr-catalog/src/jobs.rs#L1), [`core/dr-sync/src/scan.rs:69`](../core/dr-sync/src/scan.rs#L69), [`core/dr-thumbs/src/codec.rs:1`](../core/dr-thumbs/src/codec.rs#L1), [`core/dr-thumbs/src/lib.rs:1`](../core/dr-thumbs/src/lib.rs#L1), [`ui/dr-ui/src/derived_sync.rs:1`](../ui/dr-ui/src/derived_sync.rs#L1) |
 | FR-CAT-4 | [`core/dr-catalog/src/lib.rs:1`](../core/dr-catalog/src/lib.rs#L1), [`core/dr-catalog/src/query.rs:1`](../core/dr-catalog/src/query.rs#L1), [`ui/dr-ui/src/library.rs:1`](../ui/dr-ui/src/library.rs#L1), [`ui/dr-ui/src/library_ui.rs:1`](../ui/dr-ui/src/library_ui.rs#L1) |
 | FR-CAT-5 | [`core/dr-catalog/src/rating.rs:1`](../core/dr-catalog/src/rating.rs#L1), [`core/dr-decode/src/lib.rs:231`](../core/dr-decode/src/lib.rs#L231), [`core/dr-pipeline/src/sidecar.rs:125`](../core/dr-pipeline/src/sidecar.rs#L125) |
-| FR-CAT-6 | [`core/dr-catalog/src/collections.rs:1`](../core/dr-catalog/src/collections.rs#L1), [`core/dr-catalog/src/lib.rs:1`](../core/dr-catalog/src/lib.rs#L1), [`core/dr-catalog/src/query.rs:1`](../core/dr-catalog/src/query.rs#L1), [`core/dr-catalog/src/rating.rs:1`](../core/dr-catalog/src/rating.rs#L1), [`core/dr-types/src/selector.rs:1`](../core/dr-types/src/selector.rs#L1), [`ui/dr-ui/src/library.rs:139`](../ui/dr-ui/src/library.rs#L139) |
-| FR-CAT-7 | [`core/dr-catalog/src/collections.rs:1`](../core/dr-catalog/src/collections.rs#L1), [`core/dr-catalog/src/merge.rs:1`](../core/dr-catalog/src/merge.rs#L1), [`core/dr-catalog/src/sync.rs:1`](../core/dr-catalog/src/sync.rs#L1), [`core/dr-types/src/selector.rs:1`](../core/dr-types/src/selector.rs#L1), [`ui/dr-ui/src/collections_ui.rs:1`](../ui/dr-ui/src/collections_ui.rs#L1), [`ui/dr-ui/ui/collections.slint:4`](../ui/dr-ui/ui/collections.slint#L4) |
-| FR-CAT-8 | [`core/dr-pipeline/src/sidecar.rs:89`](../core/dr-pipeline/src/sidecar.rs#L89), [`ui/dr-ui/src/library.rs:228`](../ui/dr-ui/src/library.rs#L228) |
-| FR-CAT-9 | [`core/dr-catalog/src/scan.rs:1`](../core/dr-catalog/src/scan.rs#L1), [`core/dr-sync-nextcloud/src/desktop_client.rs:30`](../core/dr-sync-nextcloud/src/desktop_client.rs#L30), [`core/dr-types/src/lib.rs:95`](../core/dr-types/src/lib.rs#L95) |
+| FR-CAT-6 | [`core/dr-catalog/src/collections.rs:1`](../core/dr-catalog/src/collections.rs#L1), [`core/dr-catalog/src/lib.rs:1`](../core/dr-catalog/src/lib.rs#L1), [`core/dr-catalog/src/query.rs:1`](../core/dr-catalog/src/query.rs#L1), [`core/dr-catalog/src/rating.rs:1`](../core/dr-catalog/src/rating.rs#L1), [`core/dr-types/src/selector.rs:1`](../core/dr-types/src/selector.rs#L1), [`ui/dr-ui/src/library.rs:165`](../ui/dr-ui/src/library.rs#L165) |
+| FR-CAT-7 | [`core/dr-catalog/src/collections.rs:1`](../core/dr-catalog/src/collections.rs#L1), [`core/dr-catalog/src/merge.rs:1`](../core/dr-catalog/src/merge.rs#L1), [`core/dr-catalog/src/sync.rs:1`](../core/dr-catalog/src/sync.rs#L1), [`core/dr-types/src/selector.rs:1`](../core/dr-types/src/selector.rs#L1), [`ui/dr-ui/src/collections_ui.rs:1`](../ui/dr-ui/src/collections_ui.rs#L1), [`ui/dr-ui/src/derived_sync.rs:1`](../ui/dr-ui/src/derived_sync.rs#L1), [`ui/dr-ui/ui/collections.slint:4`](../ui/dr-ui/ui/collections.slint#L4) |
+| FR-CAT-8 | [`core/dr-pipeline/src/sidecar.rs:89`](../core/dr-pipeline/src/sidecar.rs#L89), [`ui/dr-ui/src/library.rs:277`](../ui/dr-ui/src/library.rs#L277) |
+| FR-CAT-9 | [`core/dr-catalog/src/cache.rs:1`](../core/dr-catalog/src/cache.rs#L1), [`core/dr-catalog/src/scan.rs:1`](../core/dr-catalog/src/scan.rs#L1), [`core/dr-catalog/src/schema.rs:230`](../core/dr-catalog/src/schema.rs#L230), [`core/dr-sync-nextcloud/src/desktop_client.rs:30`](../core/dr-sync-nextcloud/src/desktop_client.rs#L30), [`core/dr-sync/src/reachability.rs:1`](../core/dr-sync/src/reachability.rs#L1), [`core/dr-types/src/lib.rs:100`](../core/dr-types/src/lib.rs#L100), [`ui/dr-ui/src/library.rs:126`](../ui/dr-ui/src/library.rs#L126), [`ui/dr-ui/src/library.rs:182`](../ui/dr-ui/src/library.rs#L182), [`ui/dr-ui/src/library.rs:2118`](../ui/dr-ui/src/library.rs#L2118), [`ui/dr-ui/src/library.rs:987`](../ui/dr-ui/src/library.rs#L987), [`ui/dr-ui/src/library_ui.rs:1243`](../ui/dr-ui/src/library_ui.rs#L1243), [`ui/dr-ui/src/library_ui.rs:1398`](../ui/dr-ui/src/library_ui.rs#L1398), [`ui/dr-ui/src/library_ui.rs:165`](../ui/dr-ui/src/library_ui.rs#L165), [`ui/dr-ui/src/library_ui.rs:1683`](../ui/dr-ui/src/library_ui.rs#L1683), [`ui/dr-ui/src/library_ui.rs:1757`](../ui/dr-ui/src/library_ui.rs#L1757), [`ui/dr-ui/src/library_ui.rs:1867`](../ui/dr-ui/src/library_ui.rs#L1867), [`ui/dr-ui/src/library_ui.rs:2712`](../ui/dr-ui/src/library_ui.rs#L2712), [`ui/dr-ui/src/library_ui.rs:2740`](../ui/dr-ui/src/library_ui.rs#L2740), [`ui/dr-ui/src/library_ui.rs:281`](../ui/dr-ui/src/library_ui.rs#L281), [`ui/dr-ui/src/library_ui.rs:938`](../ui/dr-ui/src/library_ui.rs#L938), [`ui/dr-ui/src/library_ui.rs:980`](../ui/dr-ui/src/library_ui.rs#L980) |
 | FR-CULL-1 | [`core/dr-decode/src/preview.rs:96`](../core/dr-decode/src/preview.rs#L96) |
 | FR-CULL-2 | [`core/dr-decode/src/locate.rs:1`](../core/dr-decode/src/locate.rs#L1), [`core/dr-decode/src/preview.rs:123`](../core/dr-decode/src/preview.rs#L123) |
-| FR-CULL-4 | [`core/dr-catalog/src/rating.rs:1`](../core/dr-catalog/src/rating.rs#L1), [`core/dr-pipeline/src/sidecar.rs:125`](../core/dr-pipeline/src/sidecar.rs#L125), [`ui/dr-ui/src/library.rs:139`](../ui/dr-ui/src/library.rs#L139), [`ui/dr-ui/src/library.rs:228`](../ui/dr-ui/src/library.rs#L228) |
+| FR-CULL-4 | [`core/dr-catalog/src/rating.rs:1`](../core/dr-catalog/src/rating.rs#L1), [`core/dr-pipeline/src/sidecar.rs:125`](../core/dr-pipeline/src/sidecar.rs#L125), [`ui/dr-ui/src/library.rs:165`](../ui/dr-ui/src/library.rs#L165), [`ui/dr-ui/src/library.rs:277`](../ui/dr-ui/src/library.rs#L277) |
 | FR-DEV-3 | [`core/dr-pipeline/src/framing.rs:174`](../core/dr-pipeline/src/framing.rs#L174) |
 | FR-DEV-3a | [`core/dr-pipeline/src/descriptor.rs:91`](../core/dr-pipeline/src/descriptor.rs#L91), [`core/dr-pipeline/src/graph.rs:138`](../core/dr-pipeline/src/graph.rs#L138), [`core/dr-pipeline/src/graph.rs:15`](../core/dr-pipeline/src/graph.rs#L15), [`core/dr-pipeline/src/graph.rs:39`](../core/dr-pipeline/src/graph.rs#L39), [`core/dr-pipeline/src/operation.rs:104`](../core/dr-pipeline/src/operation.rs#L104) |
 | FR-DEV-3b | [`core/dr-pipeline/src/descriptor.rs:91`](../core/dr-pipeline/src/descriptor.rs#L91), [`core/dr-pipeline/src/graph.rs:39`](../core/dr-pipeline/src/graph.rs#L39), [`core/dr-pipeline/src/operation.rs:104`](../core/dr-pipeline/src/operation.rs#L104) |
@@ -55,26 +55,35 @@ A tag naming an ID `requirements.md` does not define — what renumbering produc
 | FR-DEV-3d | [`core/dr-pipeline/src/framing.rs:174`](../core/dr-pipeline/src/framing.rs#L174) |
 | FR-DEV-3e | [`core/dr-decode/src/lib.rs:442`](../core/dr-decode/src/lib.rs#L442), [`core/dr-decode/src/lib.rs:562`](../core/dr-decode/src/lib.rs#L562) |
 | FR-DEV-4 | [`core/dr-gpu/src/lib.rs:123`](../core/dr-gpu/src/lib.rs#L123) |
-| FR-DSP-1 | [`ui/dr-ui/src/lib.rs:40`](../ui/dr-ui/src/lib.rs#L40) |
+| FR-DSP-1 | [`ui/dr-ui/src/lib.rs:43`](../ui/dr-ui/src/lib.rs#L43) |
+| FR-EXP-1 | [`core/dr-types/src/settings.rs:1`](../core/dr-types/src/settings.rs#L1), [`ui/dr-ui/src/settings_ui.rs:1`](../ui/dr-ui/src/settings_ui.rs#L1) |
+| FR-EXP-2 | [`core/dr-types/src/settings.rs:1`](../core/dr-types/src/settings.rs#L1), [`ui/dr-ui/src/settings_ui.rs:1`](../ui/dr-ui/src/settings_ui.rs#L1) |
+| FR-EXP-3 | [`core/dr-types/src/settings.rs:1`](../core/dr-types/src/settings.rs#L1), [`ui/dr-ui/src/settings_ui.rs:1`](../ui/dr-ui/src/settings_ui.rs#L1) |
+| FR-EXP-4 | [`ui/dr-ui/src/settings_ui.rs:1`](../ui/dr-ui/src/settings_ui.rs#L1) |
+| FR-EXP-5 | [`ui/dr-ui/src/settings_store.rs:1`](../ui/dr-ui/src/settings_store.rs#L1) |
+| FR-EXP-6 | [`core/dr-types/src/settings.rs:1`](../core/dr-types/src/settings.rs#L1), [`ui/dr-ui/src/settings_ui.rs:1`](../ui/dr-ui/src/settings_ui.rs#L1) |
+| FR-EXP-8 | [`ui/dr-ui/src/settings_ui.rs:1`](../ui/dr-ui/src/settings_ui.rs#L1) |
 | FR-EXP-9 | [`core/dr-decode/src/lib.rs:359`](../core/dr-decode/src/lib.rs#L359) |
 | FR-NC-1 | [`core/dr-sync-nextcloud/src/auth.rs:132`](../core/dr-sync-nextcloud/src/auth.rs#L132), [`core/dr-sync-nextcloud/src/auth.rs:44`](../core/dr-sync-nextcloud/src/auth.rs#L44), [`core/dr-sync-nextcloud/src/session.rs:95`](../core/dr-sync-nextcloud/src/session.rs#L95), [`ui/dr-ui/src/launch.rs:49`](../ui/dr-ui/src/launch.rs#L49) |
-| FR-NC-12 | [`core/dr-sync-nextcloud/src/lib.rs:34`](../core/dr-sync-nextcloud/src/lib.rs#L34), [`core/dr-sync/src/lib.rs:153`](../core/dr-sync/src/lib.rs#L153), [`core/dr-sync/src/lib.rs:36`](../core/dr-sync/src/lib.rs#L36) |
+| FR-NC-12 | [`core/dr-sync-nextcloud/src/lib.rs:34`](../core/dr-sync-nextcloud/src/lib.rs#L34), [`core/dr-sync/src/lib.rs:155`](../core/dr-sync/src/lib.rs#L155), [`core/dr-sync/src/lib.rs:38`](../core/dr-sync/src/lib.rs#L38), [`core/dr-sync/src/reachability.rs:1`](../core/dr-sync/src/reachability.rs#L1) |
 | FR-NC-2 | [`core/dr-sync-nextcloud/src/session.rs:95`](../core/dr-sync-nextcloud/src/session.rs#L95) |
 | FR-NC-3 | [`core/dr-decode/src/locate.rs:1`](../core/dr-decode/src/locate.rs#L1), [`core/dr-decode/src/preview.rs:123`](../core/dr-decode/src/preview.rs#L123), [`core/dr-sync/src/capability.rs:41`](../core/dr-sync/src/capability.rs#L41), [`core/dr-thumbs/src/lib.rs:1`](../core/dr-thumbs/src/lib.rs#L1), [`ui/dr-ui/src/library.rs:1`](../ui/dr-ui/src/library.rs#L1), [`ui/dr-ui/src/library_ui.rs:1`](../ui/dr-ui/src/library_ui.rs#L1) |
-| FR-NC-4 | [`core/dr-sync-nextcloud/src/propfind.rs:100`](../core/dr-sync-nextcloud/src/propfind.rs#L100), [`core/dr-sync-nextcloud/src/propfind.rs:51`](../core/dr-sync-nextcloud/src/propfind.rs#L51), [`core/dr-sync/src/capability.rs:6`](../core/dr-sync/src/capability.rs#L6), [`core/dr-sync/src/lib.rs:153`](../core/dr-sync/src/lib.rs#L153), [`core/dr-sync/src/scan.rs:83`](../core/dr-sync/src/scan.rs#L83), [`ui/dr-ui/src/launch.rs:49`](../ui/dr-ui/src/launch.rs#L49) |
+| FR-NC-4 | [`core/dr-sync-nextcloud/src/propfind.rs:100`](../core/dr-sync-nextcloud/src/propfind.rs#L100), [`core/dr-sync-nextcloud/src/propfind.rs:51`](../core/dr-sync-nextcloud/src/propfind.rs#L51), [`core/dr-sync/src/capability.rs:6`](../core/dr-sync/src/capability.rs#L6), [`core/dr-sync/src/lib.rs:155`](../core/dr-sync/src/lib.rs#L155), [`core/dr-sync/src/scan.rs:93`](../core/dr-sync/src/scan.rs#L93), [`ui/dr-ui/src/launch.rs:49`](../ui/dr-ui/src/launch.rs#L49) |
 | FR-NC-5 | [`core/dr-sync-nextcloud/src/propfind.rs:51`](../core/dr-sync-nextcloud/src/propfind.rs#L51) |
-| FR-NC-6a | [`core/dr-types/src/selector.rs:1`](../core/dr-types/src/selector.rs#L1) |
-| FR-NC-6c | [`core/dr-sync-nextcloud/src/desktop_client.rs:30`](../core/dr-sync-nextcloud/src/desktop_client.rs#L30), [`core/dr-types/src/lib.rs:177`](../core/dr-types/src/lib.rs#L177), [`core/dr-types/src/lib.rs:95`](../core/dr-types/src/lib.rs#L95) |
-| FR-NC-8 | [`core/dr-pipeline/src/sidecar.rs:108`](../core/dr-pipeline/src/sidecar.rs#L108), [`core/dr-pipeline/src/sidecar.rs:89`](../core/dr-pipeline/src/sidecar.rs#L89), [`ui/dr-ui/src/library.rs:228`](../ui/dr-ui/src/library.rs#L228) |
+| FR-NC-6a | [`core/dr-catalog/src/cache.rs:1`](../core/dr-catalog/src/cache.rs#L1), [`core/dr-catalog/src/schema.rs:230`](../core/dr-catalog/src/schema.rs#L230), [`core/dr-catalog/src/schema.rs:635`](../core/dr-catalog/src/schema.rs#L635), [`core/dr-types/src/selector.rs:1`](../core/dr-types/src/selector.rs#L1), [`core/dr-types/src/settings.rs:1`](../core/dr-types/src/settings.rs#L1), [`ui/dr-ui/src/lib.rs:1281`](../ui/dr-ui/src/lib.rs#L1281), [`ui/dr-ui/src/lib.rs:876`](../ui/dr-ui/src/lib.rs#L876), [`ui/dr-ui/src/library.rs:813`](../ui/dr-ui/src/library.rs#L813), [`ui/dr-ui/src/library.rs:826`](../ui/dr-ui/src/library.rs#L826), [`ui/dr-ui/src/library.rs:987`](../ui/dr-ui/src/library.rs#L987), [`ui/dr-ui/src/library_ui.rs:1043`](../ui/dr-ui/src/library_ui.rs#L1043), [`ui/dr-ui/src/library_ui.rs:173`](../ui/dr-ui/src/library_ui.rs#L173), [`ui/dr-ui/src/library_ui.rs:184`](../ui/dr-ui/src/library_ui.rs#L184), [`ui/dr-ui/src/library_ui.rs:193`](../ui/dr-ui/src/library_ui.rs#L193), [`ui/dr-ui/src/library_ui.rs:242`](../ui/dr-ui/src/library_ui.rs#L242), [`ui/dr-ui/src/library_ui.rs:252`](../ui/dr-ui/src/library_ui.rs#L252), [`ui/dr-ui/src/library_ui.rs:2729`](../ui/dr-ui/src/library_ui.rs#L2729), [`ui/dr-ui/src/library_ui.rs:292`](../ui/dr-ui/src/library_ui.rs#L292), [`ui/dr-ui/src/library_ui.rs:307`](../ui/dr-ui/src/library_ui.rs#L307), [`ui/dr-ui/src/library_ui.rs:338`](../ui/dr-ui/src/library_ui.rs#L338), [`ui/dr-ui/src/library_ui.rs:701`](../ui/dr-ui/src/library_ui.rs#L701), [`ui/dr-ui/src/library_ui.rs:802`](../ui/dr-ui/src/library_ui.rs#L802), [`ui/dr-ui/src/library_ui.rs:905`](../ui/dr-ui/src/library_ui.rs#L905), [`ui/dr-ui/src/settings_store.rs:1`](../ui/dr-ui/src/settings_store.rs#L1), [`ui/dr-ui/src/settings_ui.rs:1`](../ui/dr-ui/src/settings_ui.rs#L1), [`ui/dr-ui/ui/library.slint:783`](../ui/dr-ui/ui/library.slint#L783) |
+| FR-NC-6c | [`core/dr-sync-nextcloud/src/desktop_client.rs:30`](../core/dr-sync-nextcloud/src/desktop_client.rs#L30), [`core/dr-types/src/lib.rs:100`](../core/dr-types/src/lib.rs#L100), [`core/dr-types/src/lib.rs:182`](../core/dr-types/src/lib.rs#L182) |
+| FR-NC-7 | [`core/dr-sync-nextcloud/src/lib.rs:95`](../core/dr-sync-nextcloud/src/lib.rs#L95), [`ui/dr-ui/src/derived_sync.rs:1`](../ui/dr-ui/src/derived_sync.rs#L1) |
+| FR-NC-8 | [`core/dr-pipeline/src/sidecar.rs:108`](../core/dr-pipeline/src/sidecar.rs#L108), [`core/dr-pipeline/src/sidecar.rs:89`](../core/dr-pipeline/src/sidecar.rs#L89), [`ui/dr-ui/src/library.rs:277`](../ui/dr-ui/src/library.rs#L277) |
 | FR-NC-9 | [`core/dr-catalog/src/merge.rs:1`](../core/dr-catalog/src/merge.rs#L1), [`core/dr-catalog/src/sync.rs:1`](../core/dr-catalog/src/sync.rs#L1), [`core/dr-pipeline/src/sidecar.rs:212`](../core/dr-pipeline/src/sidecar.rs#L212) |
-| FR-PLAT-AND-1 | [`core/dr-types/src/lib.rs:38`](../core/dr-types/src/lib.rs#L38) |
+| FR-PLAT-AND-1 | [`core/dr-types/src/lib.rs:43`](../core/dr-types/src/lib.rs#L43) |
 | FR-PLAT-AND-3 | [`core/dr-catalog/src/jobs.rs:1`](../core/dr-catalog/src/jobs.rs#L1) |
-| FR-RAW-1 | [`core/dr-decode/src/lib.rs:189`](../core/dr-decode/src/lib.rs#L189), [`core/dr-types/src/lib.rs:105`](../core/dr-types/src/lib.rs#L105), [`core/dr-types/src/lib.rs:176`](../core/dr-types/src/lib.rs#L176) |
+| FR-PLAT-LIN-1 | [`core/dr-types/src/settings.rs:1`](../core/dr-types/src/settings.rs#L1), [`ui/dr-ui/src/settings_store.rs:1`](../ui/dr-ui/src/settings_store.rs#L1) |
+| FR-RAW-1 | [`core/dr-decode/src/lib.rs:189`](../core/dr-decode/src/lib.rs#L189), [`core/dr-types/src/lib.rs:110`](../core/dr-types/src/lib.rs#L110), [`core/dr-types/src/lib.rs:181`](../core/dr-types/src/lib.rs#L181) |
 | FR-RAW-3 | [`core/dr-decode/src/lib.rs:359`](../core/dr-decode/src/lib.rs#L359), [`core/dr-decode/src/lib.rs:85`](../core/dr-decode/src/lib.rs#L85) |
 | FR-RAW-4 | [`core/dr-decode/src/error.rs:1`](../core/dr-decode/src/error.rs#L1) |
 | FR-RAW-5 | [`core/dr-decode/src/lib.rs:113`](../core/dr-decode/src/lib.rs#L113) |
-| FR-UI-1 | [`ui/dr-ui/src/lib.rs:48`](../ui/dr-ui/src/lib.rs#L48) |
-| FR-UI-2 | [`ui/dr-ui/src/lib.rs:48`](../ui/dr-ui/src/lib.rs#L48) |
+| FR-UI-1 | [`ui/dr-ui/src/lib.rs:51`](../ui/dr-ui/src/lib.rs#L51) |
+| FR-UI-2 | [`ui/dr-ui/src/lib.rs:51`](../ui/dr-ui/src/lib.rs#L51) |
 | FR-UI-3 | [`ui/dr-ui/ui/collections.slint:4`](../ui/dr-ui/ui/collections.slint#L4) |
 | FR-UI-5 | [`ui/dr-ui/src/collections_ui.rs:1`](../ui/dr-ui/src/collections_ui.rs#L1), [`ui/dr-ui/ui/collections.slint:4`](../ui/dr-ui/ui/collections.slint#L4) |
 | NFR-ARCH-2 | [`core/dr-catalog/src/jobs.rs:1`](../core/dr-catalog/src/jobs.rs#L1) |
@@ -88,15 +97,15 @@ A tag naming an ID `requirements.md` does not define — what renumbering produc
 | NFR-R5 | [`core/dr-catalog/src/collections.rs:1`](../core/dr-catalog/src/collections.rs#L1), [`core/dr-catalog/src/error.rs:1`](../core/dr-catalog/src/error.rs#L1), [`core/dr-catalog/src/schema.rs:1`](../core/dr-catalog/src/schema.rs#L1) |
 | NFR-R7 | [`core/dr-gpu/src/error.rs:1`](../core/dr-gpu/src/error.rs#L1) |
 | NFR-R8 | [`core/dr-gpu/src/error.rs:1`](../core/dr-gpu/src/error.rs#L1) |
-| NFR-RES-1 | [`ui/dr-ui/src/lib.rs:40`](../ui/dr-ui/src/lib.rs#L40) |
-| NFR-RES-4 | [`core/dr-thumbs/src/codec.rs:1`](../core/dr-thumbs/src/codec.rs#L1), [`core/dr-thumbs/src/lib.rs:1`](../core/dr-thumbs/src/lib.rs#L1), [`core/dr-thumbs/src/lib.rs:265`](../core/dr-thumbs/src/lib.rs#L265) |
+| NFR-RES-1 | [`ui/dr-ui/src/lib.rs:43`](../ui/dr-ui/src/lib.rs#L43) |
+| NFR-RES-4 | [`core/dr-catalog/src/cache.rs:1`](../core/dr-catalog/src/cache.rs#L1), [`core/dr-catalog/src/schema.rs:230`](../core/dr-catalog/src/schema.rs#L230), [`core/dr-thumbs/src/codec.rs:1`](../core/dr-thumbs/src/codec.rs#L1), [`core/dr-thumbs/src/lib.rs:1`](../core/dr-thumbs/src/lib.rs#L1), [`core/dr-thumbs/src/lib.rs:341`](../core/dr-thumbs/src/lib.rs#L341) |
 | NFR-SEC-1 | [`core/dr-decode/src/error.rs:1`](../core/dr-decode/src/error.rs#L1) |
 | R1 | [`tools/traceability/src/lib.rs:489`](../tools/traceability/src/lib.rs#L489), [`tools/traceability/src/lib.rs:493`](../tools/traceability/src/lib.rs#L493) |
 | R4 | [`core/dr-gpu/src/lib.rs:123`](../core/dr-gpu/src/lib.rs#L123) |
 
 ## Not yet tagged
 
-89 of 149 requirements have no implementation tag. Expected while the codebase is young; each should gain one as it is built.
+80 of 149 requirements have no implementation tag. Expected while the codebase is young; each should gain one as it is built.
 
 <details><summary>Show untagged requirements</summary>
 
@@ -127,24 +136,15 @@ A tag naming an ID `requirements.md` does not define — what renumbering produc
 - FR-DSP-6
 - FR-DSP-7
 - FR-DSP-8
-- FR-EXP-1
-- FR-EXP-2
-- FR-EXP-3
-- FR-EXP-4
-- FR-EXP-5
-- FR-EXP-6
 - FR-EXP-7
-- FR-EXP-8
 - FR-NC-10
 - FR-NC-11
 - FR-NC-6
 - FR-NC-6b
-- FR-NC-7
 - FR-PLAT-AND-2
 - FR-PLAT-AND-4
 - FR-PLAT-AND-5
 - FR-PLAT-AND-6
-- FR-PLAT-LIN-1
 - FR-PLAT-LIN-2
 - FR-PLAT-LIN-3
 - FR-RAW-2