Feat: Add bulk actions for case analysis and deletion

Introduces a new `/web/cases/bulk` endpoint to handle multiple case
actions simultaneously.

This change adds the following:
- A new `bulk` module for handling bulk operations.
- The `handle_bulk_action` function in `bulk.rs` to dispatch to specific
  actions.
- `bulk_analyze` and `bulk_delete` functions to process the actions.
- Updates `Cargo.toml` and `Cargo.lock` to include necessary
  dependencies: `form_urlencoded`, `serde_core`, `serde_html_form`, and
  `serde_path_to_error`.
- Modified `axum-extra` features to include `form`.
- Adds checks for deleted cases in `collect_pending` for both analysis
  and transcription recovery.
- Renames and modifies `handle_close_case` to `handle_analyze_case` in
  `case_actions.rs` to better reflect its functionality.
- Adds a new `handle_delete_case` and `handle_undo_delete` to
  `case_actions.rs`.
- Updates `my_cases.html` and `case_detail.html` to support bulk
  actions, including checkboxes, a bulk action bar, and an "Undo last
  delete" feature.
- Modifies `handle_audio` and `scan_cases` in `web.rs` to respect delete
  markers.
- Updates `analyze_test.rs` with new request builders for analyze and
  delete actions.

server/Cargo.lock

@@ -146,6 +146,7 @@ dependencies = [
  "axum-core",
  "bytes",
  "cookie",
+ "form_urlencoded",
  "futures-core",
  "futures-util",
  "http",
@@ -153,6 +154,9 @@ dependencies = [
  "http-body-util",
  "mime",
  "pin-project-lite",
+ "serde_core",
+ "serde_html_form",
+ "serde_path_to_error",
  "tower-layer",
  "tower-service",
  "tracing",
@@ -1493,6 +1497,19 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "serde_html_form"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2f2d7ff8a2140333718bb329f5c40fc5f0865b84c426183ce14c97d2ab8154f"
+dependencies = [
+ "form_urlencoded",
+ "indexmap",
+ "itoa",
+ "ryu",
+ "serde_core",
+]
+
 [[package]]
 name = "serde_json"
 version = "1.0.149"