Payment proofs (#52)

- Ability to export and verify payment proofs

Some fixes:
- Migrated tx heights store from lmdb (also changed heights key from local id to slate_id to avoid conflict between wallets)
- Close address panel on wallet change

Reviewed-on: https://code.gri.mw/GUI/grim/pulls/52

Cargo.lock

@@ -4077,6 +4077,7 @@ dependencies = [
  "ur",
  "url",
  "usvg",
+ "uuid 0.8.2",
  "wgpu",
  "winit",
 ]
@@ -5765,29 +5766,6 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "11d3d7f243d5c5a8b9bb5d6dd2b1602c0cb0b9db1621bafc7ed66e35ff9fe092"
 
-[[package]]
-name = "lmdb-rkv"
-version = "0.14.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "447a296f7aca299cfbb50f4e4f3d49451549af655fb7215d7f8c0c3d64bad42b"
-dependencies = [
- "bitflags 1.3.2",
- "byteorder",
- "libc",
- "lmdb-rkv-sys",
-]
-
-[[package]]
-name = "lmdb-rkv-sys"
-version = "0.11.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "61b9ce6b3be08acefa3003c57b7565377432a89ec24476bbe72e11d101f852fe"
-dependencies = [
- "cc",
- "libc",
- "pkg-config",
-]
-
 [[package]]
 name = "lmdb-zero"
 version = "0.4.4"
@@ -8433,23 +8411,20 @@ dependencies = [
 
 [[package]]
 name = "rkv"
-version = "0.19.0"
+version = "0.20.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2c6d906922d99c677624d2042a93f89b2b7df0f6411032237d5d99a602c2487c"
+checksum = "0f67a9dbc634fcd36a2d1d800ca818065dcf71a1d907dc35130c2d1552c6e1dc"
 dependencies = [
  "arrayref",
  "bincode 1.3.3",
  "bitflags 2.10.0",
- "byteorder",
  "id-arena",
  "lazy_static",
- "lmdb-rkv",
  "log",
  "ordered-float 3.9.2",
- "paste",
  "serde",
  "serde_derive",
- "thiserror 1.0.69",
+ "thiserror 2.0.18",
  "url",
  "uuid 1.20.0",
 ]