feat: liquidity depth indicator, holder snapshot history, graduation celebration, trade history table

[Yormee-103]

Closes #1108
Closes #1107
Closes #1110
Closes #1114

Changes

• Implement liquidity depth indicator on buy form #1108 Liquidity depth — the buy form shows the max keys buyable within the current slippage tolerance (largest quantity whose bonding-curve price impact stays within tolerance), updates when slippage changes, warns from 80% of the limit, disables Buy above it, and has an accessible tooltip.
• Build key holder snapshot history viewer in analytics section #1107 Holder snapshot history — new section on the key detail page: holder count and top-10 share charts with 7d / 30d / all-time selector, one marker per snapshot at its real timestamp, a current-snapshot stats card (total holders, top holder %, Gini), 5-minute cache, and handling for keys with fewer than 3 snapshots.
• Add key graduation celebration animation and share prompt #1110 Graduation — when supply reaches the final curve milestone a graduation card shows milestone stats, confetti plays once per session per key, and the share prompt has a pre-filled tweet and a copy-referral-link button.
• Implement trade history table with export to CSV #1114 Trade history — the portfolio Trade History tab is now a paginated table (Date, Key, Direction, Amount, Price, Fee, Total) with green/red chips, date-range and key-name filters, and CSV export of all matching rows (formula-injection safe).

Assumptions to confirm with the backend

• Holder snapshots are read from GET /keys/:keyId/holder-snapshots?range=7d|30d|all returning { snapshots: [{ snapshotAt, holderCount, topHolderPercent, top10SharePercent, giniCoefficient }] }.
• Trades gain an optional feeXlm; when absent the fee is shown as 0. History is loaded by following the existing cursor on GET /users/:wallet/trades, then filtered/paginated client-side.
• Graduation is detected from the existing curve config (supply ≥ highest milestone threshold).

Testing

• New tests: liquidity depth utils + TradeDialog integration, HolderSnapshotHistory, GraduationCelebration, TradeHistoryLedger (53 tests, all pass).
• ProfilePage.integration: updated the one test that asserted the old infinite-scroll trade table, since that table is replaced (8/8 pass).
• eslint and tsc -b clean on changed files. Full suite: no new failures vs upstream/dev; the ~160 existing failures (e.g. LandingPage, CreatorDetailPage, other TradeDialog suites, BatchTransferModal) are pre-existing and untouched.

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