Add full-scan mode, persist password in DB, fix channel re-check URLs, SRT subs, cookie clear, UI fixes

- Full-scan download toggle: omits --break-on-existing so all unarchived
  videos are fetched regardless of order, filling gaps in partial archives
- Filter "Aborting remaining downloads" from job logs (break-on-existing noise)
- Password hash moved from config.toml to SQLite settings table; survives
  git checkouts and rebuilds. config.toml and yt-offline.db added to .gitignore;
  config auto-generated on first run if absent
- Channel re-check URLs derived from folder name (/@handle or /channel/UCxxx)
  instead of info.json's canonical channel_url, preventing duplicate UCxxx folders
- SRT subtitles detected by library scanner and served via /api/sub-vtt/* endpoint
  that converts to WebVTT on the fly; browser <track> element can now play them
- Cookie clear button in both desktop and web UI (DELETE /api/cookies)
- Per-job X close button on finished download jobs in desktop GUI
- Fix widget ID clash when multiple download jobs are shown (push_id per job)
- Watched videos excluded from Continue Watching list and badge count
- settings table added to SQLite schema (key/value store)

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

Cargo.lock

@@ -223,6 +223,27 @@ dependencies = [
  "libloading",
 ]
 
+[[package]]
+name = "ashpd"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2f3f79755c74fd155000314eb349864caa787c6592eace6c6882dad873d9c39"
+dependencies = [
+ "enumflags2",
+ "futures-channel",
+ "futures-util",
+ "rand 0.9.4",
+ "raw-window-handle",
+ "serde",
+ "serde_repr",
+ "tokio",
+ "url",
+ "wayland-backend",
+ "wayland-client",
+ "wayland-protocols",
+ "zbus 5.15.0",
+]
+
 [[package]]
 name = "async-broadcast"
 version = "0.7.2"
@@ -903,6 +924,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1e0e367e4e7da84520dedcac1901e4da967309406d1e51017ae1abfb97adbd38"
 dependencies = [
  "bitflags 2.11.1",
+ "block2 0.6.2",
+ "libc",
  "objc2 0.6.4",
 ]
 
@@ -2330,6 +2353,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d49e936b501e5c5bf01fda3a9452ff86dc3ea98ad5f283e1455153142d97518c"
 dependencies = [
  "bitflags 2.11.1",
+ "block2 0.6.2",
  "objc2 0.6.4",
  "objc2-core-foundation",
  "objc2-core-graphics",
@@ -2626,7 +2650,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "346f04948ba92c43e8469c1ee6736c7563d71012b17d40745260fe106aac2166"
 dependencies = [
  "base64ct",
- "rand_core",
+ "rand_core 0.6.4",
  "subtle",
 ]
 
@@ -2718,6 +2742,12 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "pollster"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2f3a9f18d041e6d0e102a0a46750538147e5e8992d3b4873aaafee2520b00ce3"
+
 [[package]]
 name = "potential_utf"
 version = "0.1.5"
@@ -2850,8 +2880,18 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5ca0ecfa931c29007047d1bc58e623ab12e5590e8c7cc53200d5202b69266d8a"
 dependencies = [
  "libc",
- "rand_chacha",
- "rand_core",
+ "rand_chacha 0.3.1",
+ "rand_core 0.6.4",
+]
+
+[[package]]
+name = "rand"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "44c5af06bb1b7d3216d91932aed5265164bf384dc89cd6ba05cf59a35f5f76ea"
+dependencies = [
+ "rand_chacha 0.9.0",
+ "rand_core 0.9.5",
 ]
 
 [[package]]
@@ -2861,7 +2901,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core",
+ "rand_core 0.6.4",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3022b5f1df60f26e1ffddd6c66e8aa15de382ae63b3a0c1bfc0e4d3e3f325cb"
+dependencies = [
+ "ppv-lite86",
+ "rand_core 0.9.5",
 ]
 
 [[package]]
@@ -2873,6 +2923,15 @@ dependencies = [
  "getrandom 0.2.17",
 ]
 
+[[package]]
+name = "rand_core"
+version = "0.9.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "76afc826de14238e6e8c374ddcc1fa19e374fd8dd986b0d2af0d02377261d83c"
+dependencies = [
+ "getrandom 0.3.4",
+]
+
 [[package]]
 name = "raw-window-handle"
 version = "0.6.2"
@@ -2912,6 +2971,30 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "19b30a45b0cd0bcca8037f3d0dc3421eaf95327a17cad11964fb8179b4fc4832"
 
+[[package]]
+name = "rfd"
+version = "0.15.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ef2bee61e6cffa4635c72d7d81a84294e28f0930db0ddcb0f66d10244674ebed"
+dependencies = [
+ "ashpd",
+ "block2 0.6.2",
+ "dispatch2",
+ "js-sys",
+ "log",
+ "objc2 0.6.4",
+ "objc2-app-kit 0.3.2",
+ "objc2-core-foundation",
+ "objc2-foundation 0.3.2",
+ "pollster",
+ "raw-window-handle",
+ "urlencoding",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "web-sys",
+ "windows-sys 0.59.0",
+]
+
 [[package]]
 name = "rusqlite"
 version = "0.31.0"
@@ -3477,6 +3560,7 @@ dependencies = [
  "signal-hook-registry",
  "socket2",
  "tokio-macros",
+ "tracing",
  "windows-sys 0.61.2",
 ]
 
@@ -3736,8 +3820,15 @@ dependencies = [
  "idna",
  "percent-encoding",
  "serde",
+ "serde_derive",
 ]
 
+[[package]]
+name = "urlencoding"
+version = "2.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "daf8dba3b7eb870caf1ddeed7bc9d2a049f3cfdfae7cb521b087cc33ae4c49da"
+
 [[package]]
 name = "utf8_iter"
 version = "1.0.4"
@@ -4848,7 +4939,8 @@ dependencies = [
  "eframe",
  "image",
  "notify-rust",
- "rand",
+ "rand 0.8.6",
+ "rfd",
  "rusqlite",
  "serde",
  "serde_json",
@@ -4883,7 +4975,7 @@ dependencies = [
  "hex",
  "nix",
  "ordered-stream",
- "rand",
+ "rand 0.8.6",
  "serde",
  "serde_repr",
  "sha1",
@@ -4922,6 +5014,7 @@ dependencies = [
  "rustix 1.1.4",
  "serde",
  "serde_repr",
+ "tokio",
  "tracing",
  "uds_windows",
  "uuid",
@@ -5136,6 +5229,7 @@ dependencies = [
  "endi",
  "enumflags2",
  "serde",
+ "url",
  "winnow 1.0.2",
  "zvariant_derive 5.11.0",
  "zvariant_utils 3.3.1",