Add side panels, task selection, graph animation, and project docs

- Foldable left panel (user profile) and right panel (task details)
- Clicking a task in the list or graph node selects it and shows details
- Both views (task list + graph) always mounted via absolute inset-0 for
  correct canvas dimensions; tabs toggle visibility with opacity
- Graph node selection animation: other nodes repel outward (charge -600),
  then selected node smoothly slides to center (500ms cubic ease-out),
  then charge restores to -120 and graph stabilizes
- Graph re-fits on tab switch and panel resize via ResizeObserver
- Fix UUID string IDs throughout (backend returns UUIDs, not integers)
- Add TaskDetailPanel, UserPanel components
- Add CLAUDE.md project documentation

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/target/debug/.fingerprint/sqlx-macros-core-4f66fea09f88808e/invoked.timestamp

@@ -0,0 +1 @@
+This file has an mtime of when this was started.

backend/target/debug/.fingerprint/sqlx-macros-core-4f66fea09f88808e/lib-sqlx_macros_core

@@ -0,0 +1 @@
+57f1750ac1227dd1

backend/target/debug/.fingerprint/sqlx-macros-core-4f66fea09f88808e/lib-sqlx_macros_core.json

@@ -0,0 +1 @@
+{"rustc":5391851738765093524,"features":"[\"_rt-tokio\", \"_tls-rustls\", \"default\", \"json\", \"migrate\", \"sqlite\", \"sqlx-sqlite\", \"tokio\"]","declared_features":"[\"_rt-async-std\", \"_rt-tokio\", \"_tls-native-tls\", \"_tls-rustls\", \"async-std\", \"bigdecimal\", \"bit-vec\", \"chrono\", \"default\", \"ipnetwork\", \"json\", \"mac_address\", \"migrate\", \"mysql\", \"postgres\", \"rust_decimal\", \"sqlite\", \"sqlx-mysql\", \"sqlx-postgres\", \"sqlx-sqlite\", \"time\", \"tokio\", \"uuid\"]","target":961973412475639632,"profile":2225463790103693989,"path":9182814209142396970,"deps":[[530211389790465181,"hex",false,14212554984336338939],[996810380461694889,"sqlx_core",false,13575516371138488261],[1528297757488249563,"url",false,14659701924419566977],[2713742371683562785,"syn",false,3835293974475151970],[3405707034081185165,"dotenvy",false,14229845700805684789],[4289358735036141001,"proc_macro2",false,10832279275625900833],[5855319743879205494,"once_cell",false,3855828545801537437],[8045585743974080694,"heck",false,12331220979477859524],[9723370144619655183,"tempfile",false,5692257988142571043],[9857275760291862238,"sha2",false,15969946793932166763],[11838249260056359578,"sqlx_sqlite",false,11677188450574060166],[12170264697963848012,"either",false,7859406849043667307],[13111758008314797071,"quote",false,11666790336275478594],[13548984313718623784,"serde",false,13993743657434939901],[13795362694956882968,"serde_json",false,14792315538488301761],[17541620359049798014,"tokio",false,15060466786909538481]],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/sqlx-macros-core-4f66fea09f88808e/dep-lib-sqlx_macros_core","checksum":false}}],"rustflags":[],"config":8247474407144887393,"compile_kind":0}