fix low level issues

CHANGELOG.md

@@ -27,6 +27,22 @@
 - **No error handling in `uploadImages`** (`EditDrawer.svelte`) — wrapped upload loop in try/catch/finally so a network error clears the `uploading` spinner and surfaces an error message instead of locking the UI
 - **Stats page pagination** (`StatsView.svelte`) — heatmap now shows 4 years per page with ← Newer / Older → controls; `?page=` persisted in URL
 
+### Bug fixes — data (continued)
+
+- **`_best_climb` joins non-contiguous elevation segments** (`metrics.py`) — `None` elevation samples now reset the Kadane's window instead of being skipped and joined; GPS blackout segments can no longer inflate climb values
+- **`save_athlete` mutated `athlete.json` in-place** (`edit/server.py`, `render/merge.py`) — server now only writes `edits/athlete.yaml`; `merge_all()` applies the sidecar overlay when producing `_merged/athlete.json`, preserving extract immutability
+- **`preview_coords` off-by-one** (`simplify.py`) — subsampler was appending the final GPS point on top of `max_points`, returning `max_points + 1`; now samples `max_points - 1` slots then appends last point
+- **Non-monotonic timeseries** (`timeseries.py`) — dedup guard changed from `t == last_t` to `t <= last_t`; backwards timestamps from corrupt files are now dropped instead of creating out-of-order `t` arrays
+- **`_patch_duplicate_of` silently swallows exceptions** (`cli.py`) — changed bare `except: pass` to log a warning so failures surface during extract
+
+### Bug fixes — frontend (continued)
+
+- **Hardcoded `/activity/` URLs ignore `BASE_URL`** (`RecordsView.svelte`, `Base.astro`) — `base` prop now threaded from Astro page → `AthleteView` → `RecordsView`; upload redirect uses `import.meta.env.BASE_URL` via `define:vars`
+- **No error handling on stats page fetch** (`StatsView.svelte`) — `index.json` fetch wrapped in try/catch; error message displayed in place of heatmap instead of silent failure
+- **Map doesn't resize on container change** (`ActivityMap.svelte`) — `ResizeObserver` added to call `map.resize()` when the map container is resized
+- **`formatDuration` fractional seconds** (`format.ts`) — input floored with `Math.floor` before arithmetic; `1500.7 s` no longer displays as `25m 00.7s`
+- **Empty YAML config crashes** (`render/cli.py`, `edit/cli.py`) — `yaml.safe_load()` result guarded with `or {}`; empty config file no longer throws `AttributeError` on `.get()`
+
 ### Schema
 
 - **Writer output now matches schema** (`bas-v1.schema.json`) — `mmp`, `best_efforts`, `best_climb_m`, `preview_coords`, and `custom` are all declared in the schema; previously `additionalProperties: false` caused validation failures
@@ -34,6 +50,12 @@
 - **Sub-sport enum extended** — `nordic`, `alpine`, `open_water`, `pool` added to schema
 - **Activity ID format corrected in SCHEMA.md** — examples updated from `+0200` offset to `Z` UTC suffix (matching actual code behaviour since v0.1.0)
 
+### Tests
+
+- **Exact ID assertions** (`test_writer.py`) — `test_id_with_title` and `test_id_without_title` now assert the full ID string (`2024-06-01T073012Z-morning-ride`) instead of substrings
+- **`normalise_sub_sport` test coverage** (`test_sport.py`) — 3 new tests: Strava CamelCase conversion, ski variants, and unknown/None → `None`
+- **Invalid sport in test_merge** (`test_merge.py`) — `sport: "gravel"` replaced with valid `"running"`
+
 ### Navigation
 
 - **URL state persistence** — filter and tab state is now stored in the URL query string so the browser back button always restores the exact view you left